%0 Journal Article %A H. D. Hoang %T The theory of characteristic vectors and its application to the study of the asymptotic behavior of solutions of differential systems. I %J Differencialʹnye uravneniâ %D 1967 %P 446-467 %V 3 %N 3 %I mathdoc %U http://geodesic.mathdoc.fr/item/DE_1967_3_3_a7/ %G ru %F DE_1967_3_3_a7