共 8 条
[1]
CAI SL, 1981, CHINESE ANN MATH B, V2, P475
[4]
Negrini P., 1979, NONLINEAR ANAL, V3, P87
[5]
QIN YX, 1959, INTEGRAL CURVES DETE
[7]
Zeng Xianwu, 1982, SCI SINICA A, V1, P14
[8]
ZENG XW, 1978, ACTA MATH SINICA, V21, P263