%0 Journal Article %A M. M. Khapaev %A K. V. Mal'kov %T A class of methods for studying the asymptotic behavior of the solutions of differential equations with closed operators %J Differencialʹnye uravneniâ %D 1986 %P 255-267 %V 22 %N 2 %I mathdoc %U http://geodesic.mathdoc.fr/item/DE_1986_22_2_a10/ %G ru %F DE_1986_22_2_a10