%0 Journal Article %A M. M. Khapaev %T Investigation of stability in the theory of nonlinear oscillations %J Matematičeskie zametki %D 1968 %P 307-318 %V 3 %N 3 %I mathdoc %U http://geodesic.mathdoc.fr/item/MZM_1968_3_3_a9/ %G ru %F MZM_1968_3_3_a9