共 13 条
[1]
[Anonymous], ELECT J DIFF EQNS
[3]
Guo D., 1988, NONLINEAR PROBLEMS A
[5]
GUPTA CP, 1995, RESULTS MATH, V28, P270, DOI DOI 10.1007/BF03322257
[6]
GUPTA CP, 1995, INT J MATH MATH SCI, V18, P705
[7]
ILIN VA, 1987, DIFF EQUAT+, V23, P803