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diff --git a/.agents/skills/ml-paper-writing/templates/acl/acl_natbib.bst b/.agents/skills/ml-paper-writing/templates/acl/acl_natbib.bst
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@@ -0,0 +1,1940 @@
+%%% Modification of BibTeX style file acl_natbib_nourl.bst
+%%% ... by urlbst, version 0.9.1 (marked with "% urlbst")
+%%% See <https://purl.org/nxg/dist/urlbst> and repository <https://heptapod.host/nxg/urlbst>
+%%% Modifications Copyright 2002–23, Norman Gray,
+%%% and distributed under the terms of the LPPL; see README for discussion.
+%%%
+%%% Added webpage entry type, and url and lastchecked fields.
+%%% Added eprint support.
+%%% Added DOI support.
+%%% Added PUBMED support.
+%%% Added hyperref support.
+%%% Original headers follow...
+
+%%
+%% This is file `acl_natbib_basic.bst',
+%% generated with the docstrip utility.
+%%
+%% The original source files were:
+%%
+%% merlin.mbs  (with options: `ay,nat,pres,ed-au,keyxyr,blkyear,dt-beg,yr-per,note-yr,num-xser,pre-edn,xedn,nfss')
+%% ----------------------------------------
+%% *** Intended for ACL conferences ***
+%% 
+%% Copyright 1994-2011 Patrick W Daly
+ % ===============================================================
+ % IMPORTANT NOTICE:
+ % This bibliographic style (bst) file has been generated from one or
+ % more master bibliographic style (mbs) files, listed above.
+ %
+ % This generated file can be redistributed and/or modified under the terms
+ % of the LaTeX Project Public License Distributed from CTAN
+ % archives in directory macros/latex/base/lppl.txt; either
+ % version 1 of the License, or any later version.
+ % ===============================================================
+ % Name and version information of the main mbs file:
+ % \ProvidesFile{merlin.mbs}[2011/11/18 4.33 (PWD, AO, DPC)]
+ %   For use with BibTeX version 0.99a or later
+ %-------------------------------------------------------------------
+ % This bibliography style file is intended for texts in ENGLISH
+ % This is an author-year citation style bibliography. As such, it is
+ % non-standard LaTeX, and requires a special package file to function properly.
+ % Such a package is    natbib.sty   by Patrick W. Daly
+ % The form of the \bibitem entries is
+ %   \bibitem[Jones et al.(1990)]{key}...
+ %   \bibitem[Jones et al.(1990)Jones, Baker, and Smith]{key}...
+ % The essential feature is that the label (the part in brackets) consists
+ % of the author names, as they should appear in the citation, with the year
+ % in parentheses following. There must be no space before the opening
+ % parenthesis!
+ % With natbib v5.3, a full list of authors may also follow the year.
+ % In natbib.sty, it is possible to define the type of enclosures that is
+ % really wanted (brackets or parentheses), but in either case, there must
+ % be parentheses in the label.
+ % The \cite command functions as follows:
+ %   \citet{key} ==>>                Jones et al. (1990)
+ %   \citet*{key} ==>>               Jones, Baker, and Smith (1990)
+ %   \citep{key} ==>>                (Jones et al., 1990)
+ %   \citep*{key} ==>>               (Jones, Baker, and Smith, 1990)
+ %   \citep[chap. 2]{key} ==>>       (Jones et al., 1990, chap. 2)
+ %   \citep[e.g.][]{key} ==>>        (e.g. Jones et al., 1990)
+ %   \citep[e.g.][p. 32]{key} ==>>   (e.g. Jones et al., 1990, p. 32)
+ %   \citeauthor{key} ==>>           Jones et al.
+ %   \citeauthor*{key} ==>>          Jones, Baker, and Smith
+ %   \citeyear{key} ==>>             1990
+ %---------------------------------------------------------------------
+
+%% 2025 modified to truncate author lists of more than 20 authors
+
+ENTRY
+  { address
+    archivePrefix
+    author
+    booktitle
+    chapter
+    edition
+    editor
+    eid
+    eprint
+    eprinttype % = archivePrefix
+    howpublished
+    institution
+    journal
+    key
+    month
+    note
+    number
+    organization
+    pages
+    publisher
+    school
+    series
+    title
+    type
+    volume
+    year
+    doi % urlbst
+    pubmed % urlbst
+    url % urlbst
+    lastchecked % urlbst
+  }
+  {}
+  { label extra.label sort.label short.list }
+INTEGERS { output.state before.all mid.sentence after.sentence after.block }
+% urlbst...
+% urlbst constants and state variables
+STRINGS { urlintro
+  eprinturl eprintprefix doiprefix doiurl pubmedprefix pubmedurl
+  citedstring onlinestring linktextstring
+  openinlinelink closeinlinelink }
+INTEGERS { hrefform doiform inlinelinks makeinlinelink
+  addeprints adddoi addpubmed }
+FUNCTION {init.urlbst.variables}
+{
+  % The following constants may be adjusted by hand, if desired
+
+  % The first set allow you to enable or disable certain functionality.
+  #1 'addeprints :=	% 0=no eprints; 1=include eprints
+  #2 'hrefform :=	% 0=no crossrefs; 1=hypertex hrefs; 2=hyperref hrefs
+  #1 'inlinelinks :=	% 0=URLs explicit; 1=URLs attached to titles
+  #1 'adddoi :=	% 0=no DOI resolver; 1=include it
+  #1 'addpubmed :=	% 0=no PUBMED resolver; 1=include it
+  #0 'doiform :=	% 0=with href; 1=with \doi{}
+
+  % String constants, which you _might_ want to tweak.
+  "online" 'onlinestring :=	% label that a resource is online
+  "[link]" 'linktextstring :=	% anonymous link text
+  "http://www.ncbi.nlm.nih.gov/pubmed/" 'pubmedurl :=	% prefix to make URL from PUBMED
+  "https://doi.org/" 'doiurl :=	% prefix to make URL from DOI
+  "doi:" 'doiprefix :=	% printed text to introduce DOI
+  "https://arxiv.org/abs/" 'eprinturl :=	% prefix to make URL from eprint ref
+  "cited " 'citedstring :=	% label in "lastchecked" remark
+  "arXiv:" 'eprintprefix :=	% text prefix printed before eprint ref
+  "PMID:" 'pubmedprefix :=	% text prefix printed before PUBMED ref
+  "URL: " 'urlintro :=	% text prefix before URL
+
+  % The following are internal state variables, not configuration constants,
+  % so they shouldn't be fiddled with.
+  #0 'makeinlinelink :=     % state variable managed by possibly.setup.inlinelink
+  "" 'openinlinelink :=     % ditto
+  "" 'closeinlinelink :=    % ditto
+}
+INTEGERS {
+  bracket.state
+  outside.brackets
+  open.brackets
+  within.brackets
+  close.brackets
+}
+% ...urlbst to here
+FUNCTION {init.state.consts}
+{ #0 'outside.brackets := % urlbst...
+  #1 'open.brackets :=
+  #2 'within.brackets :=
+  #3 'close.brackets := % ...urlbst to here
+
+  #0 'before.all :=
+  #1 'mid.sentence :=
+  #2 'after.sentence :=
+  #3 'after.block :=
+}
+STRINGS { s t}
+% urlbst
+FUNCTION {output.nonnull.original}
+{ 's :=
+  output.state mid.sentence =
+    { ", " * write$ }
+    { output.state after.block =
+        { add.period$ write$
+          newline$
+          "\newblock " write$
+        }
+        { output.state before.all =
+            'write$
+            { add.period$ " " * write$ }
+          if$
+        }
+      if$
+      mid.sentence 'output.state :=
+    }
+  if$
+  s
+}
+
+% urlbst...
+% Minimal DOI parsing.
+% Given a DOI on the stack, check whether it starts with 'doiurl' or not.
+% In either case, leave on the stack first a DOI with, and then a DOI without, the URL prefix.
+FUNCTION {parse.doi}
+{
+  #1 doiurl text.length$ substring$
+  doiurl =
+    { doi
+      doi doiurl text.length$ #1 + #999 substring$ }
+    { doiurl doi *
+      doi }
+  if$
+}
+% The following three functions are for handling inlinelink.  They wrap
+% a block of text which is potentially output with write$ by multiple
+% other functions, so we don't know the content a priori.
+% They communicate between each other using the variables makeinlinelink
+% (which is true if a link should be made), and closeinlinelink (which holds
+% the string which should close any current link.  They can be called
+% at any time, but start.inlinelink will be a no-op unless something has
+% previously set makeinlinelink true, and the two ...end.inlinelink functions
+% will only do their stuff if start.inlinelink has previously set
+% closeinlinelink to be non-empty.
+% (thanks to 'ijvm' for suggested code here)
+FUNCTION {uand}
+{ 'skip$ { pop$ #0 } if$ } % 'and' (which isn't defined at this point in the file)
+FUNCTION {possibly.setup.inlinelink}
+{ makeinlinelink hrefform #0 > uand
+    { doi empty$ adddoi uand
+        { pubmed empty$ addpubmed uand
+            { eprint empty$ addeprints uand
+                { url empty$
+                    { "" }
+                    { url }
+                  if$ }
+                { eprinturl eprint * }
+              if$ }
+            { pubmedurl pubmed * }
+          if$ }
+%        { doiurl doi * }
+        { doi empty$
+            { "XXX" }
+            { doi parse.doi pop$ }
+          if$
+        }
+      if$
+      % an appropriately-formatted URL is now on the stack
+      hrefform #1 = % hypertex
+        { "\special {html:<a href=" quote$ * swap$ * quote$ * "> }{" * 'openinlinelink :=
+          "\special {html:</a>}" 'closeinlinelink := }
+        { "\href {" swap$ * "} {" * 'openinlinelink := % hrefform=#2 -- hyperref
+          % the space between "} {" matters: a URL of just the right length can cause "\% newline em"
+          "}" 'closeinlinelink := }
+      if$
+      #0 'makeinlinelink :=
+      }
+    'skip$
+  if$ % makeinlinelink
+}
+FUNCTION {add.inlinelink}
+{ openinlinelink empty$
+    'skip$
+    { openinlinelink swap$ * closeinlinelink *
+      "" 'openinlinelink :=
+      }
+  if$
+}
+FUNCTION {output.nonnull}
+{ % Save the thing we've been asked to output
+  's :=
+  % If the bracket-state is close.brackets, then add a close-bracket to
+  % what is currently at the top of the stack, and set bracket.state
+  % to outside.brackets
+  bracket.state close.brackets =
+    { "]" *
+      outside.brackets 'bracket.state :=
+    }
+    'skip$
+  if$
+  bracket.state outside.brackets =
+    { % We're outside all brackets -- this is the normal situation.
+      % Write out what's currently at the top of the stack, using the
+      % original output.nonnull function.
+      s
+      add.inlinelink
+      output.nonnull.original % invoke the original output.nonnull
+    }
+    { % Still in brackets.  Add open-bracket or (continuation) comma, add the
+      % new text (in s) to the top of the stack, and move to the close-brackets
+      % state, ready for next time (unless inbrackets resets it).  If we come
+      % into this branch, then output.state is carefully undisturbed.
+      bracket.state open.brackets =
+        { " [" * }
+        { ", " * } % bracket.state will be within.brackets
+      if$
+      s *
+      close.brackets 'bracket.state :=
+    }
+  if$
+}
+
+% Call this function just before adding something which should be presented in
+% brackets.  bracket.state is handled specially within output.nonnull.
+FUNCTION {inbrackets}
+{ bracket.state close.brackets =
+    { within.brackets 'bracket.state := } % reset the state: not open nor closed
+    { open.brackets 'bracket.state := }
+  if$
+}
+
+FUNCTION {format.lastchecked}
+{ lastchecked empty$
+    { "" }
+    { inbrackets citedstring lastchecked * }
+  if$
+}
+% ...urlbst to here
+FUNCTION {output}
+{ duplicate$ empty$
+    'pop$
+    'output.nonnull
+  if$
+}
+FUNCTION {output.check}
+{ 't :=
+  duplicate$ empty$
+    { pop$ "empty " t * " in " * cite$ * warning$ }
+    'output.nonnull
+  if$
+}
+FUNCTION {fin.entry.original} % urlbst (renamed from fin.entry, so it can be wrapped below)
+{ add.period$
+  write$
+  newline$
+}
+
+FUNCTION {new.block}
+{ output.state before.all =
+    'skip$
+    { after.block 'output.state := }
+  if$
+}
+FUNCTION {new.sentence}
+{ output.state after.block =
+    'skip$
+    { output.state before.all =
+        'skip$
+        { after.sentence 'output.state := }
+      if$
+    }
+  if$
+}
+FUNCTION {add.blank}
+{  " " * before.all 'output.state :=
+}
+
+FUNCTION {date.block}
+{
+  new.block
+}
+
+FUNCTION {not}
+{   { #0 }
+    { #1 }
+  if$
+}
+FUNCTION {and}
+{   'skip$
+    { pop$ #0 }
+  if$
+}
+FUNCTION {or}
+{   { pop$ #1 }
+    'skip$
+  if$
+}
+FUNCTION {new.block.checkb}
+{ empty$
+  swap$ empty$
+  and
+    'skip$
+    'new.block
+  if$
+}
+FUNCTION {field.or.null}
+{ duplicate$ empty$
+    { pop$ "" }
+    'skip$
+  if$
+}
+FUNCTION {emphasize}
+{ duplicate$ empty$
+    { pop$ "" }
+    { "\emph{" swap$ * "}" * }
+  if$
+}
+FUNCTION {tie.or.space.prefix} % puts ~ before the preceding part if it is of length <3
+{ duplicate$ text.length$ #3 <
+    { "~" }
+    { " " }
+  if$
+  swap$
+}
+
+FUNCTION {capitalize}
+{ "u" change.case$ "t" change.case$ }
+
+FUNCTION {space.word}
+{ " " swap$ * " " * }
+ % Here are the language-specific definitions for explicit words.
+ % Each function has a name bbl.xxx where xxx is the English word.
+ % The language selected here is ENGLISH
+FUNCTION {bbl.and}
+{ "and"}
+
+FUNCTION {bbl.etal}
+{ "et~al." }
+
+FUNCTION {bbl.editors}
+{ "editors" }
+
+FUNCTION {bbl.editor}
+{ "editor" }
+
+FUNCTION {bbl.edby}
+{ "edited by" }
+
+FUNCTION {bbl.edition}
+{ "edition" }
+
+FUNCTION {bbl.volume}
+{ "volume" }
+
+FUNCTION {bbl.of}
+{ "of" }
+
+FUNCTION {bbl.number}
+{ "number" }
+
+FUNCTION {bbl.nr}
+{ "no." }
+
+FUNCTION {bbl.in}
+{ "in" }
+
+FUNCTION {bbl.pages}
+{ "pages" }
+
+FUNCTION {bbl.page}
+{ "page" }
+
+FUNCTION {bbl.chapter}
+{ "chapter" }
+
+FUNCTION {bbl.techrep}
+{ "Technical Report" }
+
+FUNCTION {bbl.mthesis}
+{ "Master's thesis" }
+
+FUNCTION {bbl.phdthesis}
+{ "Ph.D. thesis" }
+
+MACRO {jan} {"January"}
+
+MACRO {feb} {"February"}
+
+MACRO {mar} {"March"}
+
+MACRO {apr} {"April"}
+
+MACRO {may} {"May"}
+
+MACRO {jun} {"June"}
+
+MACRO {jul} {"July"}
+
+MACRO {aug} {"August"}
+
+MACRO {sep} {"September"}
+
+MACRO {oct} {"October"}
+
+MACRO {nov} {"November"}
+
+MACRO {dec} {"December"}
+
+MACRO {acmcs} {"ACM Computing Surveys"}
+
+MACRO {acta} {"Acta Informatica"}
+
+MACRO {cacm} {"Communications of the ACM"}
+
+MACRO {ibmjrd} {"IBM Journal of Research and Development"}
+
+MACRO {ibmsj} {"IBM Systems Journal"}
+
+MACRO {ieeese} {"IEEE Transactions on Software Engineering"}
+
+MACRO {ieeetc} {"IEEE Transactions on Computers"}
+
+MACRO {ieeetcad}
+ {"IEEE Transactions on Computer-Aided Design of Integrated Circuits"}
+
+MACRO {ipl} {"Information Processing Letters"}
+
+MACRO {jacm} {"Journal of the ACM"}
+
+MACRO {jcss} {"Journal of Computer and System Sciences"}
+
+MACRO {scp} {"Science of Computer Programming"}
+
+MACRO {sicomp} {"SIAM Journal on Computing"}
+
+MACRO {tocs} {"ACM Transactions on Computer Systems"}
+
+MACRO {tods} {"ACM Transactions on Database Systems"}
+
+MACRO {tog} {"ACM Transactions on Graphics"}
+
+MACRO {toms} {"ACM Transactions on Mathematical Software"}
+
+MACRO {toois} {"ACM Transactions on Office Information Systems"}
+
+MACRO {toplas} {"ACM Transactions on Programming Languages and Systems"}
+
+MACRO {tcs} {"Theoretical Computer Science"}
+
+% bibinfo.check avoids acting on missing fields while bibinfo.warn will
+% issue a warning message if a missing field is detected. Prior to calling
+% the bibinfo functions, the user should push the field value and then its
+% name string, in that order.
+FUNCTION {bibinfo.check}
+{ swap$
+  duplicate$ missing$
+    {
+      pop$ pop$
+      ""
+    }
+    { duplicate$ empty$
+        {
+          swap$ pop$
+        }
+        { swap$
+          pop$
+        }
+      if$
+    }
+  if$
+}
+FUNCTION {bibinfo.warn}
+{ swap$
+  duplicate$ missing$
+    {
+      swap$ "missing " swap$ * " in " * cite$ * warning$ pop$
+      ""
+    }
+    { duplicate$ empty$
+        {
+          swap$ "empty " swap$ * " in " * cite$ * warning$
+        }
+        { swap$
+          pop$
+        }
+      if$
+    }
+  if$
+}
+INTEGERS { nameptr namesleft numnames }
+
+
+STRINGS  { bibinfo}
+
+FUNCTION {format.names}
+{ 'bibinfo :=
+  duplicate$ empty$ 'skip$ {
+  's :=
+  "" 't :=
+  #1 'nameptr :=
+  s num.names$ 'numnames :=
+  numnames 'namesleft :=
+    { namesleft #0 > }
+    { s nameptr
+      "{ff~}{vv~}{ll}{, jj}" % first name first for all authors
+      format.name$
+      bibinfo bibinfo.check
+      't :=
+      nameptr #1 >
+        {
+          nameptr #19	% truncate after 19 names
+          #1 + =
+          numnames #20	% if there are more than 20 names
+          > and
+            { "others" 't :=
+              #1 'namesleft := }
+            'skip$
+          if$		% end truncation of long list of names
+          namesleft #1 >
+            { ", " * t * }
+            {
+              s nameptr "{ll}" format.name$ duplicate$ "others" =
+                { 't := }
+                { pop$ }
+              if$
+              numnames #2 >
+                { "," * }
+                'skip$
+              if$
+              t "others" =
+                {
+		  %%                 " " * bbl.etal *
+		  % compute the number of remaining authors
+		  " and " * numnames nameptr - #1 + int.to.str$ * " others" *
+                }
+                {
+                  bbl.and
+                  space.word * t *
+                }
+              if$
+            }
+          if$
+        }
+        't
+      if$
+      nameptr #1 + 'nameptr :=
+      namesleft #1 - 'namesleft :=
+    }
+  while$
+  } if$
+}
+FUNCTION {format.names.ed}
+{
+  format.names
+}
+FUNCTION {format.key}
+{ empty$
+    { key field.or.null }
+    { "" }
+  if$
+}
+
+FUNCTION {format.authors}
+{ author "author" format.names
+}
+FUNCTION {get.bbl.editor}
+{ editor num.names$ #1 > 'bbl.editors 'bbl.editor if$ }
+
+FUNCTION {format.editors}
+{ editor "editor" format.names duplicate$ empty$ 'skip$
+    {
+      "," *
+      " " *
+      get.bbl.editor
+      *
+    }
+  if$
+}
+FUNCTION {format.note}
+{
+ note empty$
+    { "" }
+    { note #1 #1 substring$
+      duplicate$ "{" =
+        'skip$
+        { output.state mid.sentence =
+          { "l" }
+          { "u" }
+        if$
+        change.case$
+        }
+      if$
+      note #2 global.max$ substring$ * "note" bibinfo.check
+    }
+  if$
+}
+
+FUNCTION {format.title}
+{ title
+  duplicate$ empty$ 'skip$
+    { "t" change.case$ }
+  if$
+  "title" bibinfo.check
+}
+FUNCTION {format.full.names}
+{'s :=
+ "" 't :=
+  #1 'nameptr :=
+  s num.names$ 'numnames :=
+  numnames 'namesleft :=
+    { namesleft #0 > }
+    { s nameptr
+      "{vv~}{ll}" format.name$
+      't :=
+      nameptr #1 >
+        {
+          namesleft #1 >
+            { ", " * t * }
+            {
+              s nameptr "{ll}" format.name$ duplicate$ "others" =
+                { 't := }
+                { pop$ }
+              if$
+              t "others" =
+                {
+                  " " * bbl.etal *
+                }
+                {
+                  numnames #2 >
+                    { "," * }
+                    'skip$
+                  if$
+                  bbl.and
+                  space.word * t *
+                }
+              if$
+            }
+          if$
+        }
+        't
+      if$
+      nameptr #1 + 'nameptr :=
+      namesleft #1 - 'namesleft :=
+    }
+  while$
+}
+
+FUNCTION {author.editor.key.full}
+{ author empty$
+    { editor empty$
+        { key empty$
+            { cite$ #1 #3 substring$ }
+            'key
+          if$
+        }
+        { editor format.full.names }
+      if$
+    }
+    { author format.full.names }
+  if$
+}
+
+FUNCTION {author.key.full}
+{ author empty$
+    { key empty$
+         { cite$ #1 #3 substring$ }
+          'key
+      if$
+    }
+    { author format.full.names }
+  if$
+}
+
+FUNCTION {editor.key.full}
+{ editor empty$
+    { key empty$
+         { cite$ #1 #3 substring$ }
+          'key
+      if$
+    }
+    { editor format.full.names }
+  if$
+}
+
+FUNCTION {make.full.names}
+{ type$ "book" =
+  type$ "inbook" =
+  or
+    'author.editor.key.full
+    { type$ "proceedings" =
+        'editor.key.full
+        'author.key.full
+      if$
+    }
+  if$
+}
+
+FUNCTION {output.bibitem.original} % urlbst (renamed from output.bibitem, so it can be wrapped below)
+{ newline$
+  "\bibitem[{" write$
+  label write$
+  ")" make.full.names duplicate$ short.list =
+     { pop$ }
+     { * }
+   if$
+  "}]{" * write$
+  cite$ write$
+  "}" write$
+  newline$
+  ""
+  before.all 'output.state :=
+}
+
+FUNCTION {n.dashify}
+{
+  't :=
+  ""
+    { t empty$ not }
+    { t #1 #1 substring$ "-" =
+        { t #1 #2 substring$ "--" = not
+            { "--" *
+              t #2 global.max$ substring$ 't :=
+            }
+            {   { t #1 #1 substring$ "-" = }
+                { "-" *
+                  t #2 global.max$ substring$ 't :=
+                }
+              while$
+            }
+          if$
+        }
+        { t #1 #1 substring$ *
+          t #2 global.max$ substring$ 't :=
+        }
+      if$
+    }
+  while$
+}
+
+FUNCTION {word.in}
+{ bbl.in capitalize
+  " " * }
+
+FUNCTION {format.date}
+{ year "year" bibinfo.check duplicate$ empty$
+    {
+    }
+    'skip$
+  if$
+  extra.label *
+  before.all 'output.state :=
+  after.sentence 'output.state :=
+}
+FUNCTION {format.btitle}
+{ title "title" bibinfo.check
+  duplicate$ empty$ 'skip$
+    {
+      emphasize
+    }
+  if$
+}
+FUNCTION {either.or.check}
+{ empty$
+    'pop$
+    { "can't use both " swap$ * " fields in " * cite$ * warning$ }
+  if$
+}
+FUNCTION {format.bvolume}
+{ volume empty$
+    { "" }
+    { bbl.volume volume tie.or.space.prefix
+      "volume" bibinfo.check * *
+      series "series" bibinfo.check
+      duplicate$ empty$ 'pop$
+        { swap$ bbl.of space.word * swap$
+          emphasize * }
+      if$
+      "volume and number" number either.or.check
+    }
+  if$
+}
+FUNCTION {format.number.series}
+{ volume empty$
+    { number empty$
+        { series field.or.null }
+        { series empty$
+            { number "number" bibinfo.check }
+            { output.state mid.sentence =
+                { bbl.number }
+                { bbl.number capitalize }
+              if$
+              number tie.or.space.prefix "number" bibinfo.check * *
+              bbl.in space.word *
+              series "series" bibinfo.check *
+            }
+          if$
+        }
+      if$
+    }
+    { "" }
+  if$
+}
+
+FUNCTION {format.edition}
+{ edition duplicate$ empty$ 'skip$
+    {
+      output.state mid.sentence =
+        { "l" }
+        { "t" }
+      if$ change.case$
+      "edition" bibinfo.check
+      " " * bbl.edition *
+    }
+  if$
+}
+INTEGERS { multiresult }
+FUNCTION {multi.page.check}
+{ 't :=
+  #0 'multiresult :=
+    { multiresult not
+      t empty$ not
+      and
+    }
+    { t #1 #1 substring$
+      duplicate$ "-" =
+      swap$ duplicate$ "," =
+      swap$ "+" =
+      or or
+        { #1 'multiresult := }
+        { t #2 global.max$ substring$ 't := }
+      if$
+    }
+  while$
+  multiresult
+}
+FUNCTION {format.pages}
+{ pages duplicate$ empty$ 'skip$
+    { duplicate$ multi.page.check
+        {
+          bbl.pages swap$
+          n.dashify
+        }
+        {
+          bbl.page swap$
+        }
+      if$
+      tie.or.space.prefix
+      "pages" bibinfo.check
+      * *
+    }
+  if$
+}
+FUNCTION {format.journal.pages}
+{ pages duplicate$ empty$ 'pop$
+    { swap$ duplicate$ empty$
+        { pop$ pop$ format.pages }
+        {
+          ":" *
+          swap$
+          n.dashify
+          "pages" bibinfo.check
+          *
+        }
+      if$
+    }
+  if$
+}
+FUNCTION {format.journal.eid}
+{ eid "eid" bibinfo.check
+  duplicate$ empty$ 'pop$
+    { swap$ duplicate$ empty$ 'skip$
+      {
+          ":" *
+      }
+      if$
+      swap$ *
+    }
+  if$
+}
+FUNCTION {format.vol.num.pages}
+{ volume field.or.null
+  duplicate$ empty$ 'skip$
+    {
+      "volume" bibinfo.check
+    }
+  if$
+  number "number" bibinfo.check duplicate$ empty$ 'skip$
+    {
+      swap$ duplicate$ empty$
+        { "there's a number but no volume in " cite$ * warning$ }
+        'skip$
+      if$
+      swap$
+      "(" swap$ * ")" *
+    }
+  if$ *
+  eid empty$
+    { format.journal.pages }
+    { format.journal.eid }
+  if$
+}
+
+FUNCTION {format.chapter}
+{ chapter empty$
+    'format.pages
+    { type empty$
+        { bbl.chapter }
+        { type "l" change.case$
+          "type" bibinfo.check
+        }
+      if$
+      chapter tie.or.space.prefix
+      "chapter" bibinfo.check
+      * *
+    }
+  if$
+}
+
+FUNCTION {format.chapter.pages}
+{ chapter empty$
+    'format.pages
+    { type empty$
+        { bbl.chapter }
+        { type "l" change.case$
+          "type" bibinfo.check
+        }
+      if$
+      chapter tie.or.space.prefix
+      "chapter" bibinfo.check
+      * *
+      pages empty$
+        'skip$
+        { ", " * format.pages * }
+      if$
+    }
+  if$
+}
+
+FUNCTION {format.booktitle}
+{
+  booktitle "booktitle" bibinfo.check
+  emphasize
+}
+FUNCTION {format.in.booktitle}
+{ format.booktitle duplicate$ empty$ 'skip$
+    {
+      word.in swap$ *
+    }
+  if$
+}
+FUNCTION {format.in.ed.booktitle}
+{ format.booktitle duplicate$ empty$ 'skip$
+    {
+      editor "editor" format.names.ed duplicate$ empty$ 'pop$
+        {
+          "," *
+          " " *
+          get.bbl.editor
+          ", " *
+          * swap$
+          * }
+      if$
+      word.in swap$ *
+    }
+  if$
+}
+FUNCTION {format.thesis.type}
+{ type duplicate$ empty$
+    'pop$
+    { swap$ pop$
+      "t" change.case$ "type" bibinfo.check
+    }
+  if$
+}
+FUNCTION {format.tr.number}
+{ number "number" bibinfo.check
+  type duplicate$ empty$
+    { pop$ bbl.techrep }
+    'skip$
+  if$
+  "type" bibinfo.check
+  swap$ duplicate$ empty$
+    { pop$ "t" change.case$ }
+    { tie.or.space.prefix * * }
+  if$
+}
+FUNCTION {format.article.crossref}
+{
+  word.in
+  " \cite{" * crossref * "}" *
+}
+FUNCTION {format.book.crossref}
+{ volume duplicate$ empty$
+    { "empty volume in " cite$ * "'s crossref of " * crossref * warning$
+      pop$ word.in
+    }
+    { bbl.volume
+      capitalize
+      swap$ tie.or.space.prefix "volume" bibinfo.check * * bbl.of space.word *
+    }
+  if$
+  " \cite{" * crossref * "}" *
+}
+FUNCTION {format.incoll.inproc.crossref}
+{
+  word.in
+  " \cite{" * crossref * "}" *
+}
+FUNCTION {format.org.or.pub}
+{ 't :=
+  ""
+  address empty$ t empty$ and
+    'skip$
+    {
+      t empty$
+        { address "address" bibinfo.check *
+        }
+        { t *
+          address empty$
+            'skip$
+            { ", " * address "address" bibinfo.check * }
+          if$
+        }
+      if$
+    }
+  if$
+}
+FUNCTION {format.publisher.address}
+{ publisher "publisher" bibinfo.warn format.org.or.pub
+}
+
+FUNCTION {format.organization.address}
+{ organization "organization" bibinfo.check format.org.or.pub
+}
+
+FUNCTION {archiveprefix.or.eprinttype} % holder for eprinttype with archiveprefix precedence
+{
+  archiveprefix empty$
+  {
+    eprinttype empty$
+      { "" } % not using 'skip$ to reduce errors like "nothing to pop from stack"
+      { eprinttype }
+    if$
+  }
+  { archiveprefix }
+  if$
+}
+
+FUNCTION {output.eprint} % this is only used with the @misc record type (common for arXiv and other preprint server bibtex records)
+{
+  eprint empty$
+    {% if eprint field is empty
+      publisher field.or.null "arXiv" = % field.or.null here helps when no publisher field in the record
+        { publisher " preprint" * } % add " preprint" to publisher with the idea that publisher is the name of the preprint server
+        { "" } % if publisher != "arXiv" then empty output
+      if$
+      emphasize % no output function after emphasize because nothing goes after this
+    }
+    {% if eprint field is not empty
+      archiveprefix.or.eprinttype empty$
+        { "" } % not using 'skip$ to reduce errors like "nothing to pop from stack"
+        {% if archiveprefix or eprinttype fields are not empty
+          journal empty$
+            { "Preprint" } % if journal field is empty: output just "Preprint" emphasized like a journal name
+            { journal } % if journal field is not empty, output it (takes precedence)
+          if$
+          emphasize output % emphasize what we formed before, setting output as a border to the subblock that follows with the comma delimiter
+          archiveprefix.or.eprinttype ":" * eprint * % subblock with eprinttype and eprint number
+        }
+      if$
+    }
+  if$
+}
+
+% urlbst...
+% Functions for making hypertext links.
+% In all cases, the stack has (link-text href-url)
+%
+% make 'null' specials
+FUNCTION {make.href.null}
+{
+  pop$
+}
+% make hypertex specials
+FUNCTION {make.href.hypertex}
+{
+  "\special {html:<a href=" quote$ *
+  swap$ * quote$ * "> }" * swap$ *
+  "\special {html:</a>}" *
+}
+% make hyperref specials
+FUNCTION {make.href.hyperref}
+{
+  "\href {" swap$ * "} {\path{" * swap$ * "}}" *
+}
+FUNCTION {make.href}
+{ hrefform #2 =
+    'make.href.hyperref      % hrefform = 2
+    { hrefform #1 =
+        'make.href.hypertex  % hrefform = 1
+        'make.href.null      % hrefform = 0 (or anything else)
+      if$
+    }
+  if$
+}
+
+% If inlinelinks is true, then format.url should be a no-op, since it's
+% (a) redundant, and (b) could end up as a link-within-a-link.
+FUNCTION {format.url}
+{ inlinelinks #1 = url empty$ or
+   { "" }
+   { hrefform #1 =
+       { % special case -- add HyperTeX specials
+         urlintro "\url{" url * "}" * url make.href.hypertex * }
+       { urlintro "\url{" * url * "}" * }
+     if$
+   }
+  if$
+}
+FUNCTION {format.eprint}
+{ eprint empty$
+    { "" }
+    { eprintprefix eprint * eprinturl eprint * make.href }
+  if$
+}
+
+FUNCTION {format.doi}
+{ doi empty$
+    { "" }
+    { doi parse.doi % leaves "https://doi.org/DOI" DOI on the stack
+      's := 't :=
+      doiform #1 =
+        { "\doi{" s * "}" * }
+        { doiprefix s * t make.href }
+      if$
+    }
+  if$
+}
+
+FUNCTION {format.pubmed}
+{ pubmed empty$
+    { "" }
+    { pubmedprefix pubmed * pubmedurl pubmed * make.href }
+  if$
+}
+
+% Output a URL.  We can't use the more normal idiom (something like
+% `format.url output'), because the `inbrackets' within
+% format.lastchecked applies to everything between calls to `output',
+% so that `format.url format.lastchecked * output' ends up with both
+% the URL and the lastchecked in brackets.
+FUNCTION {output.url}
+{ url empty$
+    'skip$
+    { new.block
+      format.url output
+      format.lastchecked output
+    }
+  if$
+}
+
+FUNCTION {output.web.refs}
+{
+  new.block
+  inlinelinks
+    'skip$ % links were inline -- don't repeat them
+    { % If the generated DOI will be the same as the URL,
+      % then don't print the URL (thanks to Joseph Wright
+      % for (the original version of) this code,
+      % at http://tex.stackexchange.com/questions/5660)
+      adddoi
+          doi empty$ { "X" } { doi parse.doi pop$ } if$ % DOI URL to be generated
+          url empty$ { "Y" } { url } if$          % the URL, or "Y" if empty
+          =                                       % are the strings equal?
+          and
+        'skip$
+        { output.url }
+      if$
+      addeprints eprint empty$ not and
+        { format.eprint output.nonnull }
+        'skip$
+      if$
+      adddoi doi empty$ not and
+        { format.doi output.nonnull }
+        'skip$
+      if$
+      addpubmed pubmed empty$ not and
+        { format.pubmed output.nonnull }
+        'skip$
+      if$
+    }
+  if$
+}
+
+% Wrapper for output.bibitem.original.
+% If the URL field is not empty, set makeinlinelink to be true,
+% so that an inline link will be started at the next opportunity
+FUNCTION {output.bibitem}
+{ outside.brackets 'bracket.state :=
+  output.bibitem.original
+  inlinelinks url empty$ not doi empty$ not or pubmed empty$ not or eprint empty$ not or and
+    { #1 'makeinlinelink := }
+    { #0 'makeinlinelink := }
+  if$
+}
+
+% Wrapper for fin.entry.original
+FUNCTION {fin.entry}
+{ output.web.refs  % urlbst
+  makeinlinelink       % ooops, it appears we didn't have a title for inlinelink
+    { possibly.setup.inlinelink % add some artificial link text here, as a fallback
+      linktextstring output.nonnull }
+    'skip$
+  if$
+  bracket.state close.brackets = % urlbst
+    { "]" * }
+    'skip$
+  if$
+  fin.entry.original
+}
+
+% Webpage entry type.
+% Title and url fields required;
+% author, note, year, month, and lastchecked fields optional
+% See references
+%   ISO 690-2 http://www.nlc-bnc.ca/iso/tc46sc9/standard/690-2e.htm
+%   http://www.classroom.net/classroom/CitingNetResources.html
+%   http://neal.ctstateu.edu/history/cite.html
+%   http://www.cas.usf.edu/english/walker/mla.html
+% for citation formats for web pages.
+FUNCTION {webpage}
+{ output.bibitem
+  author empty$
+    { editor empty$
+        'skip$  % author and editor both optional
+        { format.editors output.nonnull }
+      if$
+    }
+    { editor empty$
+        { format.authors output.nonnull }
+        { "can't use both author and editor fields in " cite$ * warning$ }
+      if$
+    }
+  if$
+  new.block
+  title empty$ 'skip$ 'possibly.setup.inlinelink if$
+  format.title "title" output.check
+  inbrackets onlinestring output
+  new.block
+  year empty$
+    'skip$
+    { format.date "year" output.check }
+  if$
+  % We don't need to output the URL details ('lastchecked' and 'url'),
+  % because fin.entry does that for us, using output.web.refs.  The only
+  % reason we would want to put them here is if we were to decide that
+  % they should go in front of the rather miscellaneous information in 'note'.
+  new.block
+  note output
+  fin.entry
+}
+% ...urlbst to here
+
+
+FUNCTION {article}
+{ output.bibitem
+  format.authors "author" output.check
+  author format.key output
+  format.date "year" output.check
+  date.block
+  title empty$ 'skip$ 'possibly.setup.inlinelink if$ % urlbst
+  format.title "title" output.check
+  new.block
+  crossref missing$
+    {
+      journal
+      "journal" bibinfo.check
+      emphasize
+      "journal" output.check
+      possibly.setup.inlinelink format.vol.num.pages output% urlbst
+    }
+    { format.article.crossref output.nonnull
+      format.pages output
+    }
+  if$
+  new.block
+  format.note output
+  fin.entry
+}
+FUNCTION {book}
+{ output.bibitem
+  author empty$
+    { format.editors "author and editor" output.check
+      editor format.key output
+    }
+    { format.authors output.nonnull
+      crossref missing$
+        { "author and editor" editor either.or.check }
+        'skip$
+      if$
+    }
+  if$
+  format.date "year" output.check
+  date.block
+  title empty$ 'skip$ 'possibly.setup.inlinelink if$ % urlbst
+  format.btitle "title" output.check
+  format.edition output
+  crossref missing$
+    { format.bvolume output
+      new.block
+      format.number.series output
+      new.sentence
+      format.publisher.address output
+    }
+    {
+      new.block
+      format.book.crossref output.nonnull
+    }
+  if$
+  new.block
+  format.note output
+  fin.entry
+}
+FUNCTION {booklet}
+{ output.bibitem
+  format.authors output
+  author format.key output
+  format.date "year" output.check
+  date.block
+  title empty$ 'skip$ 'possibly.setup.inlinelink if$ % urlbst
+  format.title "title" output.check
+  new.block
+  howpublished "howpublished" bibinfo.check output
+  address "address" bibinfo.check output
+  new.block
+  format.note output
+  fin.entry
+}
+
+FUNCTION {inbook}
+{ output.bibitem
+  author empty$
+    { format.editors "author and editor" output.check
+      editor format.key output
+    }
+    { format.authors output.nonnull
+      crossref missing$
+        { "author and editor" editor either.or.check }
+        'skip$
+      if$
+    }
+  if$
+  format.date "year" output.check
+  date.block
+  title empty$ 'skip$ 'possibly.setup.inlinelink if$ % urlbst
+  format.btitle "title" output.check
+  crossref missing$
+    {
+      format.edition output
+      format.bvolume output
+      format.chapter "chapter" output.check
+      new.block
+      format.number.series output
+      new.sentence
+      format.publisher.address output
+    }
+    {
+      format.chapter "chapter" output.check
+      new.block
+      format.book.crossref output.nonnull
+    }
+  if$
+  new.block
+  format.note output
+  fin.entry
+}
+
+FUNCTION {incollection}
+{ output.bibitem
+  format.authors "author" output.check
+  author format.key output
+  format.date "year" output.check
+  date.block
+  title empty$ 'skip$ 'possibly.setup.inlinelink if$ % urlbst
+  format.title "title" output.check
+  new.block
+  crossref missing$
+    { format.in.ed.booktitle "booktitle" output.check
+      format.edition output
+      format.bvolume output
+      format.number.series output
+      format.chapter.pages output
+      new.sentence
+      format.publisher.address output
+    }
+    { format.incoll.inproc.crossref output.nonnull
+      format.chapter.pages output
+    }
+  if$
+  new.block
+  format.note output
+  fin.entry
+}
+FUNCTION {inproceedings}
+{ output.bibitem
+  format.authors "author" output.check
+  author format.key output
+  format.date "year" output.check
+  date.block
+  title empty$ 'skip$ 'possibly.setup.inlinelink if$ % urlbst
+  format.title "title" output.check
+  new.block
+  crossref missing$
+    { format.in.booktitle "booktitle" output.check
+      format.bvolume output
+      format.number.series output
+      format.pages output
+      address "address" bibinfo.check output
+      new.sentence
+      organization "organization" bibinfo.check output
+      publisher "publisher" bibinfo.check output
+    }
+    { format.incoll.inproc.crossref output.nonnull
+      format.pages output
+    }
+  if$
+  new.block
+  format.note output
+  fin.entry
+}
+FUNCTION {conference} { inproceedings }
+FUNCTION {manual}
+{ output.bibitem
+  format.authors output
+  author format.key output
+  format.date "year" output.check
+  date.block
+  title empty$ 'skip$ 'possibly.setup.inlinelink if$ % urlbst
+  format.btitle "title" output.check
+  format.edition output
+  organization address new.block.checkb
+  organization "organization" bibinfo.check output
+  address "address" bibinfo.check output
+  new.block
+  format.note output
+  fin.entry
+}
+
+FUNCTION {mastersthesis}
+{ output.bibitem
+  format.authors "author" output.check
+  author format.key output
+  format.date "year" output.check
+  date.block
+  title empty$ 'skip$ 'possibly.setup.inlinelink if$ % urlbst
+  format.title
+  "title" output.check
+  new.block
+  bbl.mthesis format.thesis.type output.nonnull
+  school "school" bibinfo.warn output
+  address "address" bibinfo.check output
+  month "month" bibinfo.check output
+  new.block
+  format.note output
+  fin.entry
+}
+
+FUNCTION {misc}
+{ output.bibitem
+  format.authors output
+  author format.key output
+  format.date "year" output.check
+  date.block
+  title empty$ 'skip$ 'possibly.setup.inlinelink if$ % urlbst
+  format.title output
+  new.block
+  howpublished "howpublished" bibinfo.check output
+  new.block
+  output.eprint output
+  new.block
+  format.note output
+  fin.entry
+}
+FUNCTION {phdthesis}
+{ output.bibitem
+  format.authors "author" output.check
+  author format.key output
+  format.date "year" output.check
+  date.block
+  title empty$ 'skip$ 'possibly.setup.inlinelink if$ % urlbst
+  format.btitle
+  "title" output.check
+  new.block
+  bbl.phdthesis format.thesis.type output.nonnull
+  school "school" bibinfo.warn output
+  address "address" bibinfo.check output
+  new.block
+  format.note output
+  fin.entry
+}
+
+FUNCTION {presentation}
+{ output.bibitem
+  format.authors output
+  author format.key output
+  new.block
+  title empty$ 'skip$ 'possibly.setup.inlinelink if$ % urlbst
+  format.title output
+  new.block
+  format.organization.address "organization and address" output.check
+  month "month" output.check
+  year "year" output.check
+  new.block
+  format.note output
+  new.sentence
+  type missing$ 'skip$
+  {"(" type capitalize * ")" * output}
+    if$
+  fin.entry
+}
+
+FUNCTION {proceedings}
+{ output.bibitem
+  format.editors output
+  editor format.key output
+  format.date "year" output.check
+  date.block
+  title empty$ 'skip$ 'possibly.setup.inlinelink if$ % urlbst
+  format.btitle "title" output.check
+  format.bvolume output
+  format.number.series output
+  new.sentence
+  publisher empty$
+    { format.organization.address output }
+    { organization "organization" bibinfo.check output
+      new.sentence
+      format.publisher.address output
+    }
+  if$
+  new.block
+  format.note output
+  fin.entry
+}
+
+FUNCTION {techreport}
+{ output.bibitem
+  format.authors "author" output.check
+  author format.key output
+  format.date "year" output.check
+  date.block
+  title empty$ 'skip$ 'possibly.setup.inlinelink if$ % urlbst
+  format.title
+  "title" output.check
+  new.block
+  format.tr.number output.nonnull
+  institution "institution" bibinfo.warn output
+  address "address" bibinfo.check output
+  new.block
+  format.note output
+  fin.entry
+}
+
+FUNCTION {unpublished}
+{ output.bibitem
+  format.authors "author" output.check
+  author format.key output
+  format.date "year" output.check
+  date.block
+  title empty$ 'skip$ 'possibly.setup.inlinelink if$ % urlbst
+  format.title "title" output.check
+  new.block
+  format.note "note" output.check
+  fin.entry
+}
+
+FUNCTION {default.type} { misc }
+READ
+FUNCTION {sortify}
+{ purify$
+  "l" change.case$
+}
+INTEGERS { len }
+FUNCTION {chop.word}
+{ 's :=
+  'len :=
+  s #1 len substring$ =
+    { s len #1 + global.max$ substring$ }
+    's
+  if$
+}
+FUNCTION {format.lab.names}
+{ 's :=
+  "" 't :=
+  s #1 "{vv~}{ll}" format.name$
+  s num.names$ duplicate$
+  #2 >
+    { pop$
+      " " * bbl.etal *
+    }
+    { #2 <
+        'skip$
+        { s #2 "{ff }{vv }{ll}{ jj}" format.name$ "others" =
+            {
+              " " * bbl.etal *
+            }
+            { bbl.and space.word * s #2 "{vv~}{ll}" format.name$
+              * }
+          if$
+        }
+      if$
+    }
+  if$
+}
+
+FUNCTION {author.key.label}
+{ author empty$
+    { key empty$
+        { cite$ #1 #3 substring$ }
+        'key
+      if$
+    }
+    { author format.lab.names }
+  if$
+}
+
+FUNCTION {author.editor.key.label}
+{ author empty$
+    { editor empty$
+        { key empty$
+            { cite$ #1 #3 substring$ }
+            'key
+          if$
+        }
+        { editor format.lab.names }
+      if$
+    }
+    { author format.lab.names }
+  if$
+}
+
+FUNCTION {editor.key.label}
+{ editor empty$
+    { key empty$
+        { cite$ #1 #3 substring$ }
+        'key
+      if$
+    }
+    { editor format.lab.names }
+  if$
+}
+
+FUNCTION {calc.short.authors}
+{ type$ "book" =
+  type$ "inbook" =
+  or
+    'author.editor.key.label
+    { type$ "proceedings" =
+        'editor.key.label
+        'author.key.label
+      if$
+    }
+  if$
+  'short.list :=
+}
+
+FUNCTION {calc.label}
+{ calc.short.authors
+  short.list
+  "("
+  *
+  year duplicate$ empty$
+  short.list key field.or.null = or
+     { pop$ "" }
+     'skip$
+  if$
+  *
+  'label :=
+}
+
+FUNCTION {sort.format.names}
+{ 's :=
+  #1 'nameptr :=
+  ""
+  s num.names$ 'numnames :=
+  numnames 'namesleft :=
+    { namesleft #0 > }
+    { s nameptr
+      "{vv{ } }{ll{ }}{  ff{ }}{  jj{ }}"
+      format.name$ 't :=
+      nameptr #1 >
+        {
+          "   "  *
+          namesleft #1 = t "others" = and
+            { "zzzzz" 't := }
+            'skip$
+          if$
+          t sortify *
+        }
+        { t sortify * }
+      if$
+      nameptr #1 + 'nameptr :=
+      namesleft #1 - 'namesleft :=
+    }
+  while$
+}
+
+FUNCTION {sort.format.title}
+{ 't :=
+  "A " #2
+    "An " #3
+      "The " #4 t chop.word
+    chop.word
+  chop.word
+  sortify
+  #1 global.max$ substring$
+}
+FUNCTION {author.sort}
+{ author empty$
+    { key empty$
+        { "to sort, need author or key in " cite$ * warning$
+          ""
+        }
+        { key sortify }
+      if$
+    }
+    { author sort.format.names }
+  if$
+}
+FUNCTION {author.editor.sort}
+{ author empty$
+    { editor empty$
+        { key empty$
+            { "to sort, need author, editor, or key in " cite$ * warning$
+              ""
+            }
+            { key sortify }
+          if$
+        }
+        { editor sort.format.names }
+      if$
+    }
+    { author sort.format.names }
+  if$
+}
+FUNCTION {editor.sort}
+{ editor empty$
+    { key empty$
+        { "to sort, need editor or key in " cite$ * warning$
+          ""
+        }
+        { key sortify }
+      if$
+    }
+    { editor sort.format.names }
+  if$
+}
+FUNCTION {presort}
+{ calc.label
+  label sortify
+  "    "
+  *
+  type$ "book" =
+  type$ "inbook" =
+  or
+    'author.editor.sort
+    { type$ "proceedings" =
+        'editor.sort
+        'author.sort
+      if$
+    }
+  if$
+  #1 entry.max$ substring$
+  'sort.label :=
+  sort.label
+  *
+  "    "
+  *
+  title field.or.null
+  sort.format.title
+  *
+  #1 entry.max$ substring$
+  'sort.key$ :=
+}
+
+ITERATE {presort}
+SORT
+STRINGS { last.label next.extra }
+INTEGERS { last.extra.num last.extra.num.extended last.extra.num.blank number.label }
+FUNCTION {initialize.extra.label.stuff}
+{ #0 int.to.chr$ 'last.label :=
+  "" 'next.extra :=
+  #0 'last.extra.num :=
+  "a" chr.to.int$ #1 - 'last.extra.num.blank :=
+  last.extra.num.blank 'last.extra.num.extended :=
+  #0 'number.label :=
+}
+FUNCTION {forward.pass}
+{ last.label label =
+    { last.extra.num #1 + 'last.extra.num :=
+      last.extra.num "z" chr.to.int$ >
+       { "a" chr.to.int$ 'last.extra.num :=
+         last.extra.num.extended #1 + 'last.extra.num.extended :=
+       }
+       'skip$
+      if$
+      last.extra.num.extended last.extra.num.blank >
+        { last.extra.num.extended int.to.chr$
+          last.extra.num int.to.chr$
+          * 'extra.label := }
+        { last.extra.num int.to.chr$ 'extra.label := }
+      if$
+    }
+    { "a" chr.to.int$ 'last.extra.num :=
+      "" 'extra.label :=
+      label 'last.label :=
+    }
+  if$
+  number.label #1 + 'number.label :=
+}
+FUNCTION {reverse.pass}
+{ next.extra "b" =
+    { "a" 'extra.label := }
+    'skip$
+  if$
+  extra.label 'next.extra :=
+  extra.label
+  duplicate$ empty$
+    'skip$
+    { year field.or.null #-1 #1 substring$ chr.to.int$ #65 < 
+      { "{\natexlab{" swap$ * "}}" * }
+      { "{(\natexlab{" swap$ * "})}" * }
+    if$ }
+  if$
+  'extra.label :=
+  label extra.label * 'label :=
+}
+EXECUTE {initialize.extra.label.stuff}
+ITERATE {forward.pass}
+REVERSE {reverse.pass}
+FUNCTION {bib.sort.order}
+{ sort.label
+  "    "
+  *
+  year field.or.null sortify
+  *
+  "    "
+  *
+  title field.or.null
+  sort.format.title
+  *
+  #1 entry.max$ substring$
+  'sort.key$ :=
+}
+ITERATE {bib.sort.order}
+SORT
+FUNCTION {begin.bib}
+{ preamble$ empty$
+    'skip$
+    { preamble$ write$ newline$ }
+  if$
+  "\begin{thebibliography}{" number.label int.to.str$ * "}" *
+  write$ newline$
+  "\providecommand{\natexlab}[1]{#1}"
+  write$ newline$
+}
+EXECUTE {begin.bib}
+EXECUTE {init.urlbst.variables} % urlbst
+EXECUTE {init.state.consts}
+ITERATE {call.type$}
+FUNCTION {end.bib}
+{ newline$
+  "\end{thebibliography}" write$ newline$
+}
+EXECUTE {end.bib}
+%% End of customized bst file
+%%
+%% End of file `acl_natbib_basic.bst'.