We consider the generalized forced Liénard equation as follows: . By applying Schauder's fixed point theorem, the existence of at least one periodic solution of this equation is proved.
"A Periodic Solution of the Generalized Forced Liénard Equation." Abstr. Appl. Anal. 2014 1 - 5, 2014. https://doi.org/10.1155/2014/132450