Existence of Periodic Solutions in Predator Prey and Competition Dynamic Systems

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Periodic solutions of functional dynamic equations with infinite delay (2008, methodology): “Based on this fact, with the help of the theory of dynamic equations on time scales and a continuation theorem in coincidence degree theory, Bohner, Fan and Zhang [2, 3] systematically unified the existence of periodic solutions of population models modeled by ordinary differential equations and the”
Periodic solutions for predator–prey systems with Beddington–DeAngelis functional response on time scales (2008, background): “in [4] considered this system on time scales and obtained Theorem A.”
Periodicity of scalar dynamic equations and applications to population models (2007, unknown): “The approach is based on a continuation theorem in coincidence degree, which has been extensively applied to explore the existence problem in ordinary differential (difference) equations but is only once [1] applied to dynamic equations on general time scales.”