Abstract
We obtain sufficient conditions for the existence of periodic solutions of the following second order nonlinear differential equation:
Our approach is based on the continuation theorem of the coincidence degree, and the priori estimate of periodic solutions.
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Zhang, Z.Q., Wang, Z.C. Periodic Solutions of a Class of Second Order Functional Differential Equations. Acta Math Sinica 21, 95–108 (2005). https://doi.org/10.1007/s10114-004-0404-5
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DOI: https://doi.org/10.1007/s10114-004-0404-5