%0 Journal Article
%A L. I. Anikeeva
%T The deficiency index of a~certain higher order differential operator
%J Trudy Matematicheskogo Instituta imeni V.A. Steklova
%D 1977
%V 32
%N 1
%I mathdoc
%U http://geodesic.mathdoc.fr/item/RM_1977_32_1_a20/
%G ru
%F RM_1977_32_1_a20