1. The number of bifurcation points of a periodic one-parameter ODE with at most two periodic solutions;Bravo;Nonlinear Anal.,2004
2. The number of bifurcation points of a periodic ordinary differential equation with cubic nonlinearities;Bravo;Nonlinear Stud.,2001
3. Nonlinear Oscillations, Dynamical Systems, and Bifurcations of Vector Fields;Guckenheimer,1983
4. A periodically forced scalar ordinary differential equation;Holmes;Internat. J. Non-Linear Mech.,1981
5. Nonlocal Bifurcations;Ilyashenko,1999