A nonautonomous plant-hare model with impulse is considered. By using the continuation theorem of coincidence degree theory, we present an easily verifiable sufficient condition on the existence of multiple periodic solutions. Though Gao et al. (2014) considered the periodic solutions of plant-hare model, such model with impulses and delay has not been studied in previous paper.
"Multiple Periodic Solutions of an Impulsive Population System with Delays." Abstr. Appl. Anal. 2014 (SI17) 1 - 7, 2014. https://doi.org/10.1155/2014/531932