We study the permanence of periodic predator-prey system with general nonlinear functional responses and stage structure for both predator and prey and obtain that the predator and the prey species are permanent.
"Permanence of PeriodicPredator-Prey System with General Nonlinear Functional Response and Stage Structure for Both Predator and Prey." Abstr. Appl. Anal. 2009 1 - 8, 2009. https://doi.org/10.1155/2009/481712