Summary
We use classical Leray-Schauder techniques in order to derive the existence of periodic solutions for Liénard differential systems.
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Conti, G., Iannacci, B. & Nkashama, M.N. Periodic solutions of Liénard systems at resonance. Annali di Matematica Pura ed applicata 139, 313–327 (1985). https://doi.org/10.1007/BF01766859
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DOI: https://doi.org/10.1007/BF01766859