%0 Journal Article
%A V. S. Mokeichev
%T In the perturbation of a boundary value problem by terms with deviating argument the spectrum can vanish
%J Differencialʹnye uravneniâ
%D 1983
%P 717-718
%V 19
%N 4
%I mathdoc
%U http://geodesic.mathdoc.fr/item/DE_1983_19_4_a28/
%G ru
%F DE_1983_19_4_a28