The existence results of positive -periodic solutions are obtained for the third-order ordinary differential equation with delays where is -periodic function and is a continuous function which is -periodic in are positive constants. The discussion is based on the fixed-point index theory in cones.
"Positive Periodic Solutions of Third-Order Ordinary Differential Equations with Delays." Abstr. Appl. Anal. 2014 1 - 8, 2014. https://doi.org/10.1155/2014/547683