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\bibitem[kan]
	N.Takayama,
	{\em Kan: A system for computation in
	algebraic analysis,} 1991 version 1,
        1994 version 2, the latest version is 2.990612.
	Source code available for Unix computers. 
         Contact the author, or download from 
	{\tt \small ftp.math.kobe-u.ac.jp} via anonymous ftp.
        See also {\tt \small www.math.kobe-u.ac.jp/KAN/}

\end{thebibliography}