%0 Journal Article
%A S. G. Krein
%T Singularly perturbed linear differential equations in a Banach space
%J Differencialʹnye uravneniâ
%D 1985
%P 1814-1817
%V 21
%N 10
%I mathdoc
%U http://geodesic.mathdoc.fr/item/DE_1985_21_10_a28/
%G ru
%F DE_1985_21_10_a28