%0 Journal Article %A V. I. Fomin %T The method of small regular perturbations in the investigation of singular differential equations in a Banach space %J Differencialʹnye uravneniâ %D 1999 %P 1712 %V 35 %N 12 %I mathdoc %U http://geodesic.mathdoc.fr/item/DE_1999_35_12_a15/ %G ru %F DE_1999_35_12_a15