共 22 条
[1]
Agarwal R.P., 1999, POSITIVE SOLUTIONS D
[3]
[Anonymous], DIFF EQNS DYN SYS
[4]
[Anonymous], 1985, NONLINEAR FUNCTIONAL
[5]
Avery R.I., 1998, Panam. Math. J, V8, P1
[6]
Avey RI, 2001, COMM APPL NONLINEAR, V8, P27
[7]
El-Shahed M, 2008, ELECTRON J QUAL THEO, P1
[8]
Eloe P. W., 1995, ELECTRON J DIFFER EQ, V1995, P1