%0 Journal Article
%A A. L. Chistyakov
%T Defect indices of $J_m$-matrices and of differential operators with polynomial coefficients
%J Sbornik. Mathematics
%D 1971
%P 471-500
%V 14
%N 4
%I mathdoc
%U http://geodesic.mathdoc.fr/item/SM_1971_14_4_a1/
%G en
%F SM_1971_14_4_a1