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\begin{thebibliography}{ }
\bibitem[kan]
N.Takayama,
{\em Kan: A system for computation in
algebraic analysis,} 1991 version 1,
1994 version 2, the latest version is 2.991106.
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}