%0 Journal Article %A B. P. Demidovich %T The orbital stability of bounded solutions of an autonomous system.~I, II %J Differencialʹnye uravneniâ %D 1968 %P 575-588 %V 4 %N 4 %I mathdoc %U http://geodesic.mathdoc.fr/item/DE_1968_4_4_a0/ %G ru %F DE_1968_4_4_a0