%0 Journal Article %A D. V. Izyumova %A J. D. Mirzov %T The oscillation and the disconjugacy of the solutions of nonlinear differential systems %J Differencialʹnye uravneniâ %D 1976 %P 1187-1193 %V 12 %N 7 %I mathdoc %U http://geodesic.mathdoc.fr/item/DE_1976_12_7_a4/ %G ru %F DE_1976_12_7_a4