Existence of Positive Periodic Solutions for a Neutral Delay Predator-Prey Model with Hassell-Varley Type Functional Response and Impulse

In this paper, we discuss a neutral delay predator-prey model with Hassel-Varley type functional response and impulse is investigated. By using Mawhin coincidence degree theory, we obtain some sufficient conditions for the existence of positive periodic solutions. We extend some known work.