共 21 条
[5]
GALAKTIONOV VA, 1983, DIFF EQUAT+, V19, P1558
[6]
Gidas B., 1981, Math. Anal. Appl., VofAdv, P369
[7]
Guo J.-S., 1992, DIFFERENTIAL INTEGRA, V5, P1237
[8]
Li FC, 2003, DISCRETE CONT DYN-A, V9, P1519