%0 Journal Article
%A L. I. Kamynin
%A B. N. Khimchenko
%T On a priori boundary estimates for the solutions of second order equations with nonnegative characteristic form
%J Doklady Akademii Nauk
%D 1977
%P 16-19
%V 232
%N 1
%I mathdoc
%U http://geodesic.mathdoc.fr/item/DAN_1977_232_1_a2/
%G ru
%F DAN_1977_232_1_a2