Permanence of periodic predator-prey system with general nonlinear functional response and stage structure for both predator and prey (Q963154)

To the best of the authors' knowledge, the permanence of non-autonomous periodic predator-prey systems with stage structure for both predator and prey, is still an open problem. Motivated by the above question, they consider a periodic predator-prey system with general nonlinear functional responses and stage structure for both predator and prey and obtain a set of sufficient and necessary conditions which ensure the permanence of this system.