Bibliography

1
Risa/Asir -- computer algebra system,
ftp://endaevor.fujitsu.co.jp/pub/isis/asir.
2
PostScript -- Language Turorial and Cookbook, (1985), Addison-Wesley
3
R.Hotta, Introduction to Algebra, Asakura-shoten, Tokyo (in Japanese).
4
T.Oaku, Gröbner basis and systems of differential equations, (1994) Seminor note series of Sophia University. (in Japanese).
5
M.Saito, B.Sturmfels, N.Takayama, Gröbner deformations of hypergeometric differential equations, to appear from Springer.
6
http://www.math.kobe-u.ac.jp/KAN and
http://www.math.kobe-u.ac.jp/$\tilde{\ }$taka
7
http://www.math.kobe-u.ac.jp/openxxx