\documentclass{article}
\usepackage{latexsym}
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\newtheorem{thm}{Theorem}
\newtheorem{cor}{Corollary}
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\begin{document}
\bibliographystyle{plain}

\nocite{GrJoSaWo:84,HeReVaWo:93,JoKrWo:95,AlWo:99,AlWo:98,AlKaWo:97}
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\end{document}