共 5 条
[1]
GOPALSAMY K, 1989, B AUSTR MATH SOC, V29, P377
[2]
GOPLASAMY K, 1986, Q APPL MATH, V44, P447
[3]
Gy??ri I., 1991, OSCILLATION THEORY D
[5]
KULENOVIC MRS, 1987, B MATH BIOL, V49, P615, DOI 10.1016/S0092-8240(87)90005-X