%0 Book %A Kashiwara, Masaki %T Algebraic study of systems of partial differential equations %S Mémoires de la Société Mathématique de France %D 1995 %N 63 %I Société mathématique de France %U http://archive.numdam.org/item/MSMF_1995_2_63__R1_0/ %R 10.24033/msmf.377 %G en %F MSMF_1995_2_63__R1_0