%0 Journal Article
%A V. S. Il'kiv
%T Perturbations of a nonlocal problem for differential equations with pseudodifferential coefficients
%J Differencialʹnye uravneniâ
%D 1990
%P 1962-1971
%V 26
%N 11
%I mathdoc
%U http://geodesic.mathdoc.fr/item/DE_1990_26_11_a16/
%G ru
%F DE_1990_26_11_a16