%0 Journal Article %A J. D. Mirzov %T Ability of the solutions of a~system of nonlinear differential equations to oscillate %J Matematičeskie zametki %D 1974 %P 571-576 %V 16 %N 4 %I mathdoc %U http://geodesic.mathdoc.fr/item/MZM_1974_16_4_a8/ %G ru %F MZM_1974_16_4_a8