%0 Journal Article
%A S. G. Krein
%A G. I. Laptev
%T Boundary value problems for second order differential equations in a Banach space. I
%J Differencialʹnye uravneniâ
%D 1966
%P 382-390
%V 2
%N 3
%I mathdoc
%U http://geodesic.mathdoc.fr/item/DE_1966_2_3_a10/
%G ru
%F DE_1966_2_3_a10