%0 Journal Article
%A S. Z. Levendorskii
%T Types of degenerate elliptic operators
%J Doklady Akademii Nauk
%D 1988
%P 24-28
%V 303
%N 1
%I mathdoc
%U http://geodesic.mathdoc.fr/item/DAN_1988_303_1_a3/
%G ru
%F DAN_1988_303_1_a3