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%%  Beispiel 02-04-4 auf Seite 25.
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%%  Copyright (C) 2011 Herbert Voss
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\AtEndDocument{\clearpage\begin{thebibliography}{ABC}
\bibitem{levy:2001}
  Steven Levy: \emph{Hackers: Heroes of the Computer Revolution}, New York: Penguin Books, 2001.
\bibitem{anbar:j_dent_res:1974}
  Marcus Anbar, Fred Farley: \emph{Potential use of organic polyphosphonates as adhesives
  in the restoration of teeth}, J Dent Res 53, 879--888, 1974.
\bibitem{PST} Timothy~Van Zandt: \emph{PSTricks: PostScript macros for Generic \TeX, User's Guide};
  Version 0.93a; March 1993; \url{CTAN://tex-archive/graphics/pstricks/obsolete/doc/pst-usr1.ps}.
\end{thebibliography}}

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\begin{document}
Was~\cite[S.\,12]{levy:2001} zeigt, sieht man in~\cite{anbar:j_dent_res:1974}
noch einmal besser formuliert.
Und nochmal~\cite{levy:2001,anbar:j_dent_res:1974,PST}.
\end{document}