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• [1] F. Brauer, J. A. Nohel, The Qualitative Theory of Ordinary Differential Equations, Dover Publication, New York,(1996).
• [2] M. Farkas, On the stability of one-predator two-prey systems, Rocky Mountain J. Math, 20, (1990), 909-916.[3] M. Farkas, H. I. Freedman, Stability conditions for two predator- one prey systems, Acta Appl. Math, 14, (1989),3-10.
• [4] K. Lakshminarayan, A. Apparao, A prey-predator model with cover linearly varying with the prey population andalternate food for the predator, Int. J. Open Problems Compt. Math, 3, (2009), 416-426.
• [5] Z. Liu, S. Zhong, Permanence and extinction analysis for a delayed periodic predator-prey system with Hollingtype II response function and diffusion, Applied Mathematics and Computation, 216, (2010), 3002-3015.
• [6] A. J. Lotka, Elements of physical Biology, New York: Dover, (1924).
• [7] B. Mukhopadhyay, R. Bhattacharyya, Dynamics of a delay-diffusion prey-predator model with disease in the prey,J. Appl. Math. and Computing, 20, (2005), 361-377.
• [8] V. Volterra, Lecons sur la th´eorie mathematique de la leitte pour la vie, Gauthier-Villars, paris, (1931).
• [9] X. Zhou, X. Shi, X. Song. X, Analysis of a delay prey-predator model with disease in the prey species only, J.Korean Math. Soc 46, (2009), 713-731.