%0 Journal Article
%A I. V. Skrypnik
%T A condition for the regularity of a boundary point for a
%J Doklady Akademii Nauk
%D 1991
%P 821-824
%V 320
%N 4
%I mathdoc
%U http://geodesic.mathdoc.fr/item/DAN_1991_320_4_a10/
%G ru
%F DAN_1991_320_4_a10