[1] Rahmani Doust, M.H. and Gholizade, S. (2014). An analysis of the modified Lotka-Volterra predator-prey equations, Gen. Math. Notes, 25, 2, 1-5.
[2] Rahmani Doust, M.H. and Gholizade, S. (2014). The lotka- Volterra predator-prey equations, Caspian Journal of Mathematical Sciences, 3(1), 227-231.
[3] Rahmani Doust, M. H. (2015). The efficiency of harvest factor; Lotka-Volterra predator-prey model, Caspian Journal of Mathematical Sciences, 4(1), 51-59.
[4] Li Y. K., and Ye, Y. (2013). Multiple positive almost periodic solutions to an impulsive non-autonomous Lotka-Volterra predator-prey system with harvesting terms, common. Non-linear sci. Number. Simul. 18, 3190-3201.
[5] XU, C. and Zhang, Q. (2014) Permanence and asymptotically periodic solution for a cyclic predator-prey model with sigmoidal type functional response, Wseas transactions on Systems, 13, 668-678.
[6] Yang, Y. and Chen, W.C. (2006). Uniformly strong persistence of a nonlinear asymptotically periodic multispecies competition predator-prey system with general functional response, Appl. Math. Comput. 183, 423-426.
[7] Yuan, R., (1992). Existence of almost periodic solutions of functional differential equations of neutral type, J. Math. Anal. Appl. 165, 524-538.
[8] Murray, J.D. (2002). Mathematical biology (Vol. 1: An Introduction). Springer, New York.
[9] Murray, J.D. (2003). Mathematical biology (Vol. 2: Spatial models and biomedical applications). Springer, New York.
[10] Cornin, J. (2008). Ordinary differential equations. Third Edition, Chapman & Hall/CRC.New York.
[11] Perco, L. (2001). Differential equations and dynamical systems. Springer, New York.
[12] Miller, R.K. and Michel A.N. (1982). Ordinary differential equations, Academic press, New York.
[13] رحمانی دوست، محمدحسین، (1392). معادلات دیفرانسیل و اکولوژی جلد اول، انتشارات نوروزی، گرگان. دانشگاه نیشابور.
[14] Montes F. de Oca, and Vivas, M. (2006). Extinction in a two dimensional Lotka-Volterra system with infinite delay. Nonlinear Anal. Real World Appl. 7, 1042-1047.
