%0 Journal Article %A S. A. Korolev %A A. D. Morozov. %T On periodic perturbations of self-oscillating pendulum equations %J Russian journal of nonlinear dynamics %D 2010 %P 79-89 %V 6 %N 1 %I mathdoc %U http://geodesic.mathdoc.fr/item/ND_2010_6_1_a4/ %G ru %F ND_2010_6_1_a4