共 7 条
[2]
HALANAI A, 1974, QUALITATIVE THEORY I
[3]
Millman VD., 1963, APPROX METHODS SOLVI, V1, P64
[4]
Milman V.D., 1960, SIBERIAN MATH J+, V1, P233
[5]
Pandit S., 1982, DIFFERENTIAL SYSTEMS
[7]
SAMOILENKO AM, 1977, DIFF EQUAT, V11, P1981