OSCILLATION CRITERIA FOR A CLASS OF SECOND ORDER NONLINEAR DIFFERENTIAL EQUATIONS WITH DAMPING.

In this paper, some oscillation criteria for solutions of a general second order non-linear differential equations with damping of the form (a(t) ψ (x (t)) k (x' (t)))' + p (t) k (x' (t)) + q (t) f (x (t)) = 0, are given. The results obtained extend some existing results in the literature by using the refined integral averaging technique introduced by Rogovchenko and Tuncay). [ABSTRACT FROM AUTHOR]