1. Nonlinear oscillations, dynamical systems, and bifurcations of vector fields;Guckenheimer,1983
2. Elements of applied bifurcation theory;Kuznetsov,1995
3. Bifurcations in impact systems;Ivanov;Chaos, Solitons & Fractals,1996
4. Bifurcations in nonlinear discontinuous systems;Leine;Nonlinear Dynam,2000
5. Theory of impulsive differential equations;Lsksmikantham,1989