%0 Journal Article
%A A. A. Novruzov
%T On a necessary and sufficient condition for regularity of boundary points for quasi-linear elliptic equations of second order
%J Doklady Akademii Nauk
%D 1977
%P 547-550
%V 233
%N 4
%I mathdoc
%U http://geodesic.mathdoc.fr/item/DAN_1977_233_4_a9/
%G ru
%F DAN_1977_233_4_a9