This paper deals with a nonlinear differential equation, by using the fixed point theory. The existence of the periodic solution of the nonlinear differential equation is obtained; these results are new.
"The Fixed Point Theory and the Existence of the Periodic Solution on a Nonlinear Differential Equation." J. Appl. Math. 2018 1 - 11, 2018. https://doi.org/10.1155/2018/6725989