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On existence of periodic solutions of Rayleigh equation of retarded type. (English) Zbl 1115.34067
Summary: Existence of periodic solutions for a class of non-autonomous Rayleigh equations of retarded type $x''(t)+f(t,x'(t-\sigma))+g(t,x(t-\tau(t)))=p(t)$ is studied, and some new results are obtained.

##### MSC:
 34K13 Periodic solutions to functional-differential equations
##### Keywords:
Rayleigh equations; periodic solution; priori estimate
Full Text:
##### References:
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