1. Theory of Bifurcations of Dynamical Systems on a Plane;Andronov,1973
2. Handbook of Elliptic Integrals for Engineers and Scientists;Byrd,1971
3. Methods of Bifurcation Theory;Chow,1982
4. Asymptotic Methods for Relaxation Ocillations and Applications;Grasman,1987
5. Dynamical Systems and Bifurcations of Vector Fields;Guckenheimer,1983