%0 Journal Article
%A A. L. Chistyakov
%T Deficiency indices of symmetric differential operators with polynomial coefficients
%J Doklady Akademii Nauk
%D 1969
%P 268-271
%V 186
%N 2
%I mathdoc
%U http://geodesic.mathdoc.fr/item/DAN_1969_186_2_a6/
%G ru
%F DAN_1969_186_2_a6