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如题，承接上问，https://wenda.latexstudio.net/q-1423.html
这个问号意思大概就是文献没有找到，没有定义。
现在给一个例子：
```tex
\documentclass[onecolumn]{article}
\usepackage{xcite}
\usepackage{xr-hyper} % \usepackage{xr}
\usepackage{graphicx}
\graphicspath{{figures/}}
\usepackage[colorlinks,linkcolor=black,anchorcolor=black,citecolor=black,urlcolor=black]{hyperref}
\externaldocument{../RNN_TEVC_v2/CBG_TEVC_v2}
\externalcitedocument{../RNN_TEVC_v2/CBG_TEVC_v2}
\begin{document}
This is a example: \ref{fig-flowchart} .
cite\cite{rakitianskaia2016analysis, gallagher2001fitness, phan2013error}
\ref{aaa}
aaa
\end{document}
```
外部文件相关内容如下：
```tex
\labeltext{The current problem generators, however, produce problems with homogeneous internal structures and regular basins of attraction (Fig. \ref{fig-contsCompar9}), which consequently, to some extent, reduces the optimization difficulty \cite{pitzer2012comprehensive}. }\label{aaa}
```
效果图：
console信息：
```
Command Line: bibtex.exe "response"
Startup Folder: D:\工作\科研\项目\测试问题生成-CLG-TEC\TEC修改\Response
bibtex: warning: running with administrator privileges
This is BibTeX, Version 0.99d (MiKTeX 2.9.6840 64-bit)
The top-level auxiliary file: response.aux
I found no \bibdata command---while reading file response.aux
I found no \bibstyle command---while reading file response.aux
(There were 2 error messages)
Command Line: texify.exe --pdf --tex-option=--interaction=errorstopmode --tex-option=--synctex=1 "D:\工作\科研\项目\测试问题生成-CLG-TEC\TEC修改\Response\response.tex"
Startup Folder: D:\工作\科研\项目\测试问题生成-CLG-TEC\TEC修改\Response
texify: warning: running with administrator privileges
pdflatex: warning: running with administrator privileges
This is pdfTeX, Version 3.14159265-2.6-1.40.19 (MiKTeX 2.9.6840 64-bit)
entering extended mode
(D:/工作/科研/项目/测试问题生成-CLG-TEC/TEC修改/Response/response
.tex
LaTeX2e <2018> patch level 5
("D:\SOFTWARE\MiKTeX 2.9\tex\latex\base\article.cls"
Document Class: article 2007/10/19 v1.4h Standard LaTeX document class
("D:\SOFTWARE\MiKTeX 2.9\tex\latex\base\size10.clo"))
("D:\SOFTWARE\MiKTeX 2.9\tex\latex\xcite\xcite.sty")
("D:\SOFTWARE\MiKTeX 2.9\tex\latex\hyperref\xr-hyper.sty")
("D:\SOFTWARE\MiKTeX 2.9\tex\latex\graphics\graphicx.sty"
("D:\SOFTWARE\MiKTeX 2.9\tex\latex\graphics\keyval.sty")
("D:\SOFTWARE\MiKTeX 2.9\tex\latex\graphics\graphics.sty"
("D:\SOFTWARE\MiKTeX 2.9\tex\latex\graphics\trig.sty")
("D:\SOFTWARE\MiKTeX 2.9\tex\latex\graphics-cfg\graphics.cfg")
("D:\SOFTWARE\MiKTeX 2.9\tex\latex\graphics-def\pdftex.def")))
("D:\SOFTWARE\MiKTeX 2.9\tex\latex\hyperref\hyperref.sty"
("D:\SOFTWARE\MiKTeX 2.9\tex\generic\oberdiek\hobsub-hyperref.sty"
("D:\SOFTWARE\MiKTeX 2.9\tex\generic\oberdiek\hobsub-generic.sty"))
("D:\SOFTWARE\MiKTeX 2.9\tex\generic\ifxetex\ifxetex.sty")
("D:\SOFTWARE\MiKTeX 2.9\tex\latex\oberdiek\kvoptions.sty")
("D:\SOFTWARE\MiKTeX 2.9\tex\latex\hyperref\pd1enc.def")
("D:\SOFTWARE\MiKTeX 2.9\tex\latex\00miktex\hyperref.cfg")
("D:\SOFTWARE\MiKTeX 2.9\tex\latex\url\url.sty"))
Package hyperref Message: Driver (autodetected): hpdftex.
("D:\SOFTWARE\MiKTeX 2.9\tex\latex\hyperref\hpdftex.def"
("D:\SOFTWARE\MiKTeX 2.9\tex\latex\oberdiek\rerunfilecheck.sty")) (response.aux
) ("D:\SOFTWARE\MiKTeX 2.9\tex\context\base\supp-pdf.mkii"
[Loading MPS to PDF converter (version 2006.09.02).]
) ("D:\SOFTWARE\MiKTeX 2.9\tex\latex\oberdiek\epstopdf-base.sty"
("D:\SOFTWARE\MiKTeX 2.9\tex\latex\oberdiek\grfext.sty"))
("D:\SOFTWARE\MiKTeX 2.9\tex\latex\graphics\color.sty"
("D:\SOFTWARE\MiKTeX 2.9\tex\latex\graphics-cfg\color.cfg"))
("D:\SOFTWARE\MiKTeX 2.9\tex\latex\hyperref\nameref.sty"
("D:\SOFTWARE\MiKTeX 2.9\tex\generic\oberdiek\gettitlestring.sty"))
(response.out) (response.out)
! Undefined control sequence.
cite.\XC@prefix
rakitianskaia2016analysis\@extra@b@citeb
l.13 ...ysis, gallagher2001fitness, phan2013error}
?
Process has been terminated ...
```
