摘要

The asymptotic behavior of the nonoscillatory solutions of quasilinear differential equations of second order with delay depending on the unknown function is considered. The main results given by [Bainov et al. (J. Comput. Appl. Math. 91 (1998) 87-96) and Wong (Funkcial. Ekvac. 11 (1968) 207-234)] are improved and generalized.