[1] Smith,J.,Model in Ecology,Cambridge Publication,Cambridge,England(1977).
[2] May,R.,Theoretical Ecology,Blackwell Scientific Publication,Oxford(1981).
[3] Braum,M.,Differential Equation and Application.Springer-Verlag.New York(1976).
[4] O’Malley,Introduction to Singular Perturbation Theory,Academic Press(1974).
[5] Goh,B.S.,Global stability in two species interaction,J.Math.Biology,3,(1976),313-318.
[6] Hsa,S.B.,The application of poincare transform to Lotka-Volterra model,J.Math.Biology,6(1978),67-73.
[7] Levin,S.,Harvesting and Two Species Interaction,Lecture Notes in Biomathematics (25) Springer-Verlag,New York,(1978),156-163.
[8] Hofbauer.J.,On the occurrence of limit cycles in the Lotka-Volterra equation,Nonlinear Analysis 5,9(1981) 1003-1006. |