如果我使用此代码：
\documentclass[10pt,a5paper,twoside]{memoir}
\begin{document}
\cite{abntex2classe}
\bibliography{refs2}
\end{document}
我赢了：
LaTeX Warning: Citation `abntex2classe' on page 1 undefined on input line 5.
LaTeX Warning: There were undefined references.
但如果我运行另一个：
\documentclass[10pt,a5paper,twoside]{abntex2}
\usepackage[hyperpageref]{backref}
\usepackage[alf]{abntex2cite}
% Package hyperref Warning: Token not allowed in a PDF string?
% https://tex.stackexchange.com/questions/384885/package-hyperref-warning-token
\pdfstringdefDisableCommands{\let\uppercase\relax}
\begin{document}
\tableofcontents*
\chapter[Nullam]{Nullam elementum}
Nullam elementum
\section[Some encoding tests]{showfont}
Nullam elementum \cite{abntex2classe} Nullam elementum
\bibliography{refs2}
\end{document}
它工作正常。怎么会这样？
这是的内容refs2.bib：
@manual{abntex2classe,
Author = {abnTeX2 and Lauro},
Organization = {Equipe abnTeX2},
Title = {A classe abntex2},
Note = {Substitui \cite{abntex2classe2}},
Year = {2013}}
@manual{abntex2classe2,
Author = {abnTeX2 and Lauro},
Organization = {Equipe abnTeX2},
Title = {A classe abntex2},
Year = {2013}}
我想我应该加载一些包，但我已经看过了这个问题LaTeX 警告：引用未定义但他们似乎没有加载任何参考书目包。
为了编译，我运行，，，，完整pdflatex日志：bibtexpdflatexpdflatex
This is pdfTeX, Version 3.14159265-2.6-1.40.18 (MiKTeX 2.9.6400) (preloaded format=pdflatex 2017.8.23) 25 AUG 2017 16:34
entering extended mode
**./test3.tex
(test3.tex
LaTeX2e <2017-04-15>
Babel <3.12> and hyphenation patterns for 76 language(s) loaded.
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Package: ifpdf 2017/03/15 v3.2 Provides the ifpdf switch
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(D:\User\Documents\latex\texmfs\install\tex\latex\ifetex\ifetex.sty
Package: ifetex 2011/12/15 v1.2 ifetex
(D:\User\Documents\latex\texmfs\install\tex\plain\ifetex\ifetex.tex))
(D:\User\Documents\latex\texmfs\install\tex\generic\ifxetex\ifxetex.sty
Package: ifxetex 2010/09/12 v0.6 Provides ifxetex conditional
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(D:\User\Documents\latex\texmfs\install\tex\generic\oberdiek\ifluatex.sty
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LaTeX Info: Redefining \em on input line 7551.
LaTeX Info: Redefining \emph on input line 7559.
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LaTeX Info: Redefining \: on input line 12068.
LaTeX Info: Redefining \! on input line 12070.
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Package abstract [2008/07/23] emulated by memoir.
Package appendix [2008/07/23] emulated by memoir.
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Package booktabs [2016/05/16] emulated by memoir.
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Package ifmtarg [2008/07/23] emulated by memoir.
Package index [2008/07/23] emulated by memoir.
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Package pagenote [2008/07/23] emulated by memoir.
Package parskip [2008/07/23] emulated by memoir.
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Package shortvrb [2008/07/23] emulated by memoir.
Package showidx [2008/07/23] emulated by memoir.
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Package verbatim [2008/07/23] emulated by memoir.
Package verse [2008/07/23] emulated by memoir.
(D:\User\Documents\latex\texmfs\install\tex\latex\memoir\mempatch.sty
Package: mempatch 2009/07/24 v6.0f Patches for memoir class v1.6180339
))
(D:\User\Dropbox\Applications\SoftwareVersioning\SublimeText\Data\Cache\LaTeXTo
ols\3fadaf268cce53dfbb2db491bf19775c\test3.aux)
\openout1 = `test3.aux'.
LaTeX Font Info: Checking defaults for OML/cmm/m/it on input line 3.
LaTeX Font Info: ... okay on input line 3.
LaTeX Font Info: Checking defaults for T1/cmr/m/n on input line 3.
LaTeX Font Info: ... okay on input line 3.
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LaTeX Font Info: ... okay on input line 3.
LaTeX Warning: Citation `abntex2classe' on page 1 undefined on input line 5.
(D:\User\Dropbox\Applications\SoftwareVersioning\SublimeText\Data\Cache\LaTeXTo
ols\3fadaf268cce53dfbb2db491bf19775c\test3.bbl) [1{D:/User/Documents/latex/texm
fs/data/pdftex/config/pdftex.map}
]
(D:\User\Dropbox\Applications\SoftwareVersioning\SublimeText\Data\Cache\LaTeXTo
ols\3fadaf268cce53dfbb2db491bf19775c\test3.aux)
LaTeX Warning: There were undefined references.
)
Here is how much of TeX's memory you used:
3525 strings out of 493314
48155 string characters out of 3134142
130135 words of memory out of 3000000
7126 multiletter control sequences out of 15000+200000
4899 words of font info for 18 fonts, out of 3000000 for 9000
1141 hyphenation exceptions out of 8191
30i,10n,22p,129b,219s stack positions out of 5000i,500n,10000p,200000b,50000s
<D:/User/Documents/latex/texmfs/install/fonts/type1/public/amsfonts/cm/cmbx10
.pfb><D:/User/Documents/latex/texmfs/install/fonts/type1/public/amsfonts/cm/cmr
10.pfb>
Output written on D:\User\Dropbox\Applications\SoftwareVersioning\SublimeText\D
ata\Cache\LaTeXTools\3fadaf268cce53dfbb2db491bf19775c\test3.pdf (1 page, 18088
bytes).
PDF statistics:
14 PDF objects out of 1000 (max. 8388607)
0 named destinations out of 1000 (max. 500000)
1 words of extra memory for PDF output out of 10000 (max. 10000000)
答案1
在您的第一个代码（类memoir）中，您的代码中缺少一个\bibliographystyle{}。参考书目样式定义了参考书目的布局。因为我不知道您需要哪种样式，所以我只使用了plain。
因此以下 MWE
\RequirePackage{filecontents}
\begin{filecontents}{\jobname.bib}
@manual{abntex2classe,
Author = {abnTeX2 and Lauro},
Organization = {Equipe abnTeX2},
Title = {A classe abntex2},
Note = {Substitui \cite{abntex2classe2}},
Year = {2013}
}
@manual{abntex2classe2,
Author = {abnTeX2 and Lauro},
Organization = {Equipe abnTeX2},
Title = {A classe abntex2},
Year = {2013}
}
\end{filecontents}
\documentclass[10pt,a5paper,twoside]{memoir}
\begin{document}
\cite{abntex2classe}
\bibliographystyle{plain} % <===========================================
\bibliography{\jobname}
\end{document}
结果是
我不知道您使用的第二个类abntex2，但它似乎预定义了一个特殊的参考书目样式供使用。因此您不需要添加自己的参考书目样式。
答案2
您没有注意到一个例子和另一个例子之间的区别：
\usepackage[hyperpageref]{backref}
\usepackage[alf]{abntex2cite}
只需将这两行添加到第一个例子：
\documentclass[10pt,a5paper,twoside]{memoir}
\usepackage[hyperpageref]{backref}
\usepackage[alf]{abntex2cite}
\begin{document}
\cite{abntex2classe}
\bibliography{sample}
\end{document}
您想使用一个包，但您没有加载它……这没有意义。查看abntex2和abntex2-cite手册了解更多信息。
答案3
在 Adobe Reader 中打开 PDF 文件时出现此错误。请确保其他进程没有处理您的输出文件。