Periodic perturbations of non-conservative second order differential equations

R. A. Chouikha, University of Paris, Paris, France

E. J. Qualitative Theory of Diff. Equ., No. 4. (2002), pp. 1-12.

Abstract: Consider the Lienard system $u''+f(u) u'+g(u)=0$ with an isolated periodic solution. This paper concerns the behavior of periodic solutions of Lienard system under small periodic perturbations.

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