%0 Journal Article
%A S. R. Umarov
%T Nonlocal boundary value problems for pseudodifferential and operator-differential equations.~I
%J Differencialʹnye uravneniâ
%D 1997
%P 827-836
%V 33
%N 6
%I mathdoc
%U http://geodesic.mathdoc.fr/item/DE_1997_33_6_a16/
%G ru
%F DE_1997_33_6_a16