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How do I create something like this without getting any errors?

\begin{thm}[\cite[page 10]{ABC2011}]
...
\end{thm}

I tried putting various things into {...} brackets, but not eliminating any errors. I probably have misunderstood something about how LaTeX works in the background and the AMS packet:

\usepackage[amsmath,thmmarks]{ntheorem}
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2 Answers 2

up vote 11 down vote accepted

Mask the content of thm' s optional argument with an additional set of braces.

EDIT: For what it's worth, with ntheorem loaded one needs two additional sets of braces.

\documentclass{article}

\usepackage{ntheorem}

\newtheorem{thm}{Theorem}

\begin{document}

\begin{thm}[{{\cite[page 10]{ABC2011}}}]
A theorem.
\end{thm}

\begin{thebibliography}{9}
\bibitem{ABC2011} A bibitem.
\end{thebibliography}

\end{document}
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Thanks for the fast response. I get these errors, when I do that: Argument of \@citex has an extra }. Runaway argument? page 10\color@endgroup Latex Error: Paragraph ended before \@citex was complete. Latex Error: Extra }, or forgotten \endgroup. –  user46365 May 1 '11 at 19:01
    
It must be some other package which is causing troubles :\ –  user46365 May 1 '11 at 19:03
    
Tried it on a fresh file and it worked like a charm.. bummer. –  user46365 May 1 '11 at 19:04
    
@user46365: What packages that might affect theorems do you use (amsthm, ntheorem)? What document class? A working example would be even better. –  lockstep May 1 '11 at 19:04
    
@user46365: Strange enough, my example still works if I load amsthm, but not with ntheorem. Obviously you don't use ntheorem if it works for you now. –  lockstep May 1 '11 at 19:07
\documentclass{article}
\usepackage{ntheorem}
\newtheorem{thm}{Theorem}

\begin{document}

\begin{thm}[\protect{\cite[page 10]{ABC2011}}]
A theorem.
\end{thm}

\begin{thebibliography}{9}
\bibitem{ABC2011} A bibitem.
\end{thebibliography}

\end{document}

regards

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thanks marco for your help. –  user46365 May 1 '11 at 19:23

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