共 7 条
[1]
BUTENIN NV, 1965, ELEMENTS THEORY NONL
[2]
Davis HT., 1962, INTRO NONLINEAR DIFF
[3]
GOULD SH, 1966, VARIATION METHOD EIG
[4]
Hale J. K., 1963, OSCILLATIONS NONLINE
[5]
HSIEH DY, TO BE PUBLISHED
[6]
Mathews J., 1970, MATH METHODS PHYS, V2nd
[7]
SOKOLNIFKOFF IS, 1956, MATHEMATICAL THEORY