%0 Journal Article
%A V. S. Belonosov
%T Indices of instability of differential operators
%J Doklady Akademii Nauk
%D 1985
%P 1037-1041
%V 284
%N 5
%I mathdoc
%U http://geodesic.mathdoc.fr/item/DAN_1985_284_5_a1/
%G ru
%F DAN_1985_284_5_a1