1. The ring principle and quasi-attractors;Afraimovich,1991
2. Limit cycles and chaos in pendulum-type equations;Morozov;Prikl. Mat. Mekh.,1989
3. Pendulum-type equations and resonances;Morozov,1980
4. Non-conservative periodic systems close to two-dimensional Hamiltonian systems;Morozov;Prikl. Mat. Mekh.,1983
5. On the global behaviour of self-oscillatory systems;Morozov;Int. J. Bifurcation and Chaos,1993