Derivations of Skew Polynomial Rings Naoki Hamaguchi, Atsushi Nakajima (2002) Publications de l'Institut Mathématique
Differential equations and maximal ideals on the Weyl algebra A 2 ( ℂ ) Giuliano Bratti, Masako Takagi (2002) Rendiconti del Seminario Matematico della Università di Padova
Direct image of the de Rham system associated with a rational double point Shinichi Tajima (1997) Banach Center Publications