共 21 条
[1]
Andronov A. A., 1949, THEORY OSCILLATIONS
[2]
Bogoliubov N. N., 1961, ASYMPTOTIC METHODS T
[3]
BRUSHLIN.NN, 1961, DOKL AKAD NAUK SSSR+, V139, P9
[5]
Halanay A., 1966, DIFF EQUAT+
[6]
Hale J., 1969, ORDINARY DIFFERENTIA
[7]
Hale J. K., 1963, OSCILLATIONS NONLINE
[10]
HALE JK, 1963, CONTRIB DIFFER EQUAT, V0002, P00291