In this paper we study the existence of 2 pi-periodic solutions of -(|x'|(p-2)x')' = lambda|x|(p-2)x + f(t), x is an element of R where p > 1, lambda is an eigenvalue of the corresponding homogeneous equation, f is a 2 pi-periodic function. Some existence results are proved via the Morse theory. (C) 2010 Elsevier Inc. All rights reserved.Mathematics, AppliedMathematicsSCI(E)3ARTICLE1107-13137
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