%0 Journal Article
%A M. V. Fokin
%T The spectrum of a certain operator
%J Differencialʹnye uravneniâ
%D 1971
%P 135-141
%V 7
%N 1
%I mathdoc
%U http://geodesic.mathdoc.fr/item/DE_1971_7_1_a14/
%G ru
%F DE_1971_7_1_a14