共 9 条
[2]
Bogoliubov N. N., 1961, ASYMPTOTIC METHODS T
[4]
El'sgol'ts L.L., 1961, DIFFERENTIAL EQUATIO
[6]
KAKO M, 1972, IPPJ128 NAG U I PLAS
[9]
TANIUTI T, 1971, DPNU29 NAG U DEPT PH