共 13 条
[1]
Chanturia T. A., 1980, DIFF URAVN, V16, P470
[2]
CHUANXI Q, 1990, CANAD MATH B, V33, P442
[3]
Erbe L.H., 1995, Oscillation Theory for Functional Differential Equations
[4]
Farrell K., 1988, APPL ANAL, V27, P181
[5]
GYORI I, 1991, OSCILLATION THEORY F
[6]
Luo ZG, 2000, DYN CONTIN DISCRET I, V7, P489