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- [22] The Existence of a Positive Periodic Solution of the Wangersky–Cunningham Predator-Prey System Allowing for Periodic Changes in the Environment Differential Equations, 2002, 38 : 303 - 309
- [23] Existence of Positive Periodic Solution of Periodic Time-Dependent Predator-Prey System with Impulsive Effects Acta Mathematica Sinica, 2004, 20 : 423 - 432