%0 Journal Article %A G. S. Krechetov %T Certain sufficient conditions for the asymptotic stability of the zero solution of a nonautonomous system of two differential equations %J Differencialʹnye uravneniâ %D 1969 %P 612-625 %V 5 %N 4 %I mathdoc %U http://geodesic.mathdoc.fr/item/DE_1969_5_4_a1/ %G ru %F DE_1969_5_4_a1