%0 Journal Article
%A A. F. Andreev
%T A sharpening of the uniqueness theorem for an $O$-curve in $N_2$
%J Doklady Akademii Nauk
%D 1962
%P 9-10
%V 146
%N 1
%I mathdoc
%U http://geodesic.mathdoc.fr/item/DAN_1962_146_1_a0/
%G ru
%F DAN_1962_146_1_a0