%0 Journal Article
%A A. R. Sagitova
%T On the deficiency indices of a~differential operator of fourth order
%J Matematičeskie zametki
%D 1995
%P 313-314
%V 57
%N 2
%I mathdoc
%U http://geodesic.mathdoc.fr/item/MZM_1995_57_2_a17/
%G ru
%F MZM_1995_57_2_a17