Beamer - Weird bug in bibliography

Question

I am putting bibliography in my last frame. It seems that the command

\beamerdefaultoverlayspecification{<+->}

makes the article symbols look like book. You can see this by remarking this command in the following code:

\documentclass{beamer}

\usecolortheme{crane}

\beamerdefaultoverlayspecification{<+->}

\begin{document}
    \begin{frame}{For Further Reading}

  \begin{thebibliography}{10}

  \beamertemplatebookbibitems

  \bibitem{Author1990}
    A.~Author.
    \newblock {\em Handbook of Everything}.
    \newblock Some Press, 1990.

  \beamertemplatearticlebibitems

  \bibitem{Someone2000}
    S.~Someone.
    \newblock On this and that.
    \newblock {\em Journal of This and That}, 2(1):50--100,
    2000.
  \end{thebibliography}
\end{frame}
\end{document}

Just for curiosity I would like to know how to overcome this bug. However, I would actually like to show all bibliography items at once and not gradually in my presentation, which might resolve the problem. So my question is - how do I cancel the effect of \beamerdefaultoverlayspecification{<+->} for one specific frame?

Answer 1

It is possible to change the overlay specification mid-document. Simply add \beamerdefaultoverlayspecification{} immediately before the frame that includes your bibliography.

To confine the changes to this frame and switch back to whatever overlay specification was valid before, you may write

\begingroup
\beamerdefaultoverlayspecification{}

<code for bibliography frame>

\endgroup

Answer 2

For displaying bibliography items separately, specifying a separate overlay produces the desired result:

\documentclass{beamer}% http://ctan.org/pkg/beamer
\usecolortheme{crane}
%\beamerdefaultoverlayspecification{<+->}
\begin{document}
\begin{frame}{For Further Reading}
  \begin{thebibliography}{10}
  \beamertemplatebookbibitems
  \bibitem{Author1990}
    A.~Author.
    \newblock {\em Handbook of Everything}.
    \newblock Some Press, 1990.

  \beamertemplatearticlebibitems
  \visible<2->{\bibitem{Someone2000}
    S.~Someone.
    \newblock On this and that.
    \newblock {\em Journal of This and That}, 2(1):50--100,
    2000.}
  \end{thebibliography}
\end{frame}
\end{document}

I used \visible<2-> to make the item only visible from slide 2 onward.