共 16 条
[1]
Bruhat F., 1959, COMMENT MATH HELV, V33, P132
[2]
CESARI L, 1959, DIFFERENTIAL EQUATIO
[3]
Coddington E. A., 1955, THEORY ORDINARY DIFF
[4]
Lefschetz S., 1957, DIFFERENTIAL EQUATIO
[5]
LEFSCHETZ S, 1954, COMMENT MATH HELV, V28, P341
[10]
PETROWSKI IG, 1934, REC MATH MAT SB, V41, P107