%0 Journal Article
%A A. A. Novruzov
%T On the regularity of boundary points for second order equations with nonnegative characteristic form
%J Doklady Akademii Nauk
%D 1976
%P 1039-1042
%V 230
%N 5
%I mathdoc
%U http://geodesic.mathdoc.fr/item/DAN_1976_230_5_a6/
%G ru
%F DAN_1976_230_5_a6