Periodic solutions for a delayed predator-prey system with dispersal and impulses. Liu, Qiming, Dong, Shijie (2005) 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]
Permanence and periodic solution of predator-prey system with holling type functional response and impulses. Wang, Weibing, Shen, Jianhua, Nieto, Juan J. (2007) Discrete Dynamics in Nature and Society
Positive periodic solutions for a predator-prey model with time delays and impulsive effect. Gao, Shan, Li, Yongkun (2008) Electronic Journal of Differential Equations (EJDE) [electronic only]
Positive periodic solutions for an impulsive ratio-dependent predator-prey system with delays. Liu, Yan, Wang, Quanyi (2008) Electronic Journal of Differential Equations (EJDE) [electronic only]
Positive periodic solutions for nonautonomous impulsive neutral functional differential systems with time-varying delays on time scales. Dai, Jinchun, Li, Yongkun, Zhang, Tianwei (2010) Electronic Journal of Differential Equations (EJDE) [electronic only]
Positive periodic solutions of impulsive delay differential equations with sign-changing coefficient. Liu, Yuji, Bai, Zhanbing, Gui, Zhanjie, Ge, Weigao (2004) Portugaliae Mathematica. Nova Série
Positive periodic solutions of neutral functional differential equations with a parameter and impulse. Fan, Xuanlong, Li, Yongkun (2008) Electronic Journal of Differential Equations (EJDE) [electronic only]