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Periodic solutions for a class of forced Liénard-type equations. (English) Zbl 1093.34020
By applying the topological degree theory, some sufficient conditions for the existence of $$T$$-periodic solutions for the Liénard-type equation $x''+\Sigma^n_{i=1} h_i(x)| x'| ^{2\alpha_i}+f_1(x)| x'| ^2+f_2(x)x'+g(t,x)=p(t)$ are established.

##### MSC:
 34C25 Periodic solutions to ordinary differential equations 47H11 Degree theory for nonlinear operators
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##### References:
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