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\documentclass{beamer}\usepackage{beamerthemesplit}\begin{document}\frame{\cite[p.290]{HorJoh}}\begin{thebibliography}{10}\bibitem{HorJoh}[HorJoh]Horn, R. A. and Johnson, C. R\newblock Matrix Analysis\newblock Cambridge University Press, U.S.A., 1985.\end{thebibliography}\end{document}