Formal solutions of a class of Pfaffian systems in two variables
1981 ◽
Vol 18
(01)
◽
pp. 263-267
◽
1984 ◽
Vol 51
(1)
◽
pp. 48-77
◽
Keyword(s):
1969 ◽
Vol 48
(4)
◽
pp. 311-340
◽