共 10 条
- [1] Erbe L.H., 1995, Oscillation Theory for Functional Differential Equations
- [2] Gy??ri I., 1991, OSCILLATION THEORY D
- [4] LADAS G, 1992, FUNKCIAL EKVAC, V25, P105
- [7] Tang Xianhua, 2000, Applied Mathematics. Series B, A Journal of Chinese Universities, V15, P21
- [9] YU JS, 1991, ACTA MATH SINICA, V34, P517
- [10] YU JS, 1990, ACTA MATH SINICA, V33, P152