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A note on periodic solutions of certain second-order nonlinear differential equations. (English) Zbl 0391.34021

MSC:

34C25 Periodic solutions to ordinary differential equations
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References:

[1] Cronin, J., Fixed Points and Topological Degree in Nonlinear Analysis, (Math. Survey II (1964), Amer. Math. Soc: Amer. Math. Soc Providence, R.I) · Zbl 0117.34803
[2] Lazer, A. C., On Schauder’s fixed point theorem and forced second-order nonlinear oscillations, J. Math. Anal. Appl., 21, 421-425 (1968) · Zbl 0155.14001
[3] Chang, S. H., Periodic solutions of certain second order nonlinear differential equations, J. Math. Anal. Appl., 49, 263-266 (1975) · Zbl 0294.34032
[4] Cesari, L., Asymptotic Behavior and Stability Problems (1963), Springer: Springer Berlin · Zbl 0111.08701
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