Existence of positive periodic solutions for a class of nonautonomous difference equations. Zeng, Zhijun — 2006 Electronic Journal of Differential Equations (EJDE) [electronic only]
Periodicity of solutions to delayed dynamic equations with feedback control. Zeng, Zhijun — 2010 Electronic Journal of Differential Equations (EJDE) [electronic only]
Periodicity in a delayed ratio-dependent predator-prey system with exploited term. Zeng, Zhijun; Zhai, Li — 2007 Electronic Journal of Differential Equations (EJDE) [electronic only]