1. Inverse problems connected with periods of oscillations described x¨+g(x)=0;Alfawicka;Ann. Polon. Math.,1984
2. Strong isochronism of the center for dynamical systems with second-order polynomials on the right-hand side;Amelkin;Differ. Equ.,1993
3. Theory of Bifurcations of Dynamic Systems on a Plane;Andronov,1973
4. Vibration Theory;Andronov,1959
5. Nonlinear Phenomena in Power Electronics: Attractors, Bifurcations, Chaos, and Nonlinear Control;Banerjee,2001