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引用标题 beamer

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引用标题 beamer 
\documentclass{beamer}
\usepackage[latin1]{inputenc}
\usepackage{graphicx}
\usepackage{tikz}
\usepackage{wasysym}

\usetheme{CambridgeUS}

\title{Beamer o Beamer}
\author{mishr}

\begin{document}

\begin{frame}
\titlepage
\end{frame}

%slide 0
\begin{frame}
\frametitle{Introduction}

\begin{itemize}
    \item Item A \cite{author1} %This works
    \item ItemB


\end{frame}

\begin{frame}
\begin{figure}
    \includegraphics[scale=0.4]{fig}
    \caption{Some figure\protect \cite{Author}}%This doesn't work.
\end{figure}
\end{frame}

\begin{frame}
\frametitle{Bibliography}
\bibliographystyle{abbrvnat}
\bibliography{pres}
\end{frame}

%bib 文件名为 pres.bib

我在 Beamer 中使用上述方法。多次运行后，引用结果为 [?]。文本中的引用效果很好。有什么想法吗？

编辑：添加了 MWE。

答案1

我发现以下代码没有任何问题。我已删除\protect.MikTeX 2.9 和beamer3.20A。我已将命令放入\listfiles文件中，以便软件包的版本信息打印在日志文件中。

\documentclass{beamer}
\listfiles
\usepackage[latin1]{inputenc}
\usepackage{lmodern} % Irrelevant for the problem but suppresses warnings
\usepackage{mwe}     % Adds the dummy image used and loads graphicx
%\usepackage{tikz}    % Not needed for the problem
%\usepackage{wasysym} % Same here
\usetheme{CambridgeUS}
\usepackage{filecontents} % For a dummy bibfile creation
\begin{filecontents*}{mybibfile.bib}
@ARTICLE{authora,
  author = {A. Aaaaa},
  title = {Some article},
  journal = {Journal of Dummy Article Names},
  year = {2012},
  volume = {99},
  pages = {1-5}
}

@ARTICLE{authorb,
  author = {B. Baaaa},
  title = {Another article},
  journal = {Journal of Dummy Article Names},
  year = {2012},
  volume = {99},
  pages = {6-10}
}

\end{filecontents*}



\title{Beamer o Beamer}
\author{mishr}

\begin{document}

\begin{frame}
\frametitle{Introduction}
\begin{itemize}
    \item Item A \cite{authora} %This works
    \item ItemB
\end{itemize}
\end{frame}

\begin{frame}
\begin{figure}
    \includegraphics[scale=0.4]{example-image-a}
    \caption{Some figure from \cite{authorb}}%This doesn't work.
\end{figure}
\end{frame}

\begin{frame}
\frametitle{Bibliography}
\bibliographystyle{abbrvnat}
\bibliography{mybibfile}
\end{frame}

\end{document}

在此处输入图片描述

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