%0 Journal Article
%A M. M. Gekhtman
%A I. V. Stankevich
%T On the spectrum of non-selfadjoint differential operators
%J Doklady Akademii Nauk
%D 1964
%P 29-32
%V 158
%N 1
%I mathdoc
%U http://geodesic.mathdoc.fr/item/DAN_1964_158_1_a5/
%G ru
%F DAN_1964_158_1_a5