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+%%% 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'.