We study the existence of periodic solutions of the second-order differential equation , where are two constants satisfying , , is a constant satisfying , are continuous, and is -periodic. When the limits exist and are finite, we give some sufficient conditions for the existence of -periodic solutions of the given equation.
"Periodic Solutions of Duffing Equation with an Asymmetric Nonlinearity and a Deviating Argument." Abstr. Appl. Anal. 2013 1 - 8, 2013. https://doi.org/10.1155/2013/507854