如何在破折号内引用两个参考文献？

Question

代码

\documentclass[10pt, a4paper, oneside]{scrartcl}

\usepackage{lipsum} 

\title{\normalfont{Technical Report: Loren Ipsum}} 

\author{{Alex Murphy}}

\date{}

\begin{document}

\maketitle

\section*{Abstract} 

Test cite \cite{key1, key2}  \lipsum[1] % Dummy text


\begin{thebibliography}{1}

\bibitem{key1} John Doe {\em Title and stuff}  2013.
\bibitem{key2} John Doe {\em Title and stuff}  2014.

\end{thebibliography}

\end{document}

输出

但是，我想显示类似的引用，[1-2]而不是[1, 2]。我怎样才能这样做？