Periodic solutions for prescribed mean curvature Lienard equation with a deviating argument

Using coincidence degree theory and different techniques from those used by N. Cac, this paper is devoted to study the existence of periodic solutions for a prescribed mean curvature Lienard equation with a deviating argument (x'/root 1+x'(2))'+ f(x(t))x'(t) + g (t, x(t - tau(t))) = e(t), where g is an element of C(R-2, R-1), f, e and tau are T-periodic. The results are illustrated with an example, which cannot be handled using the existing results. (C) 2011 Elsevier Ltd. All rights reserved.