%0 Journal Article
%A S. K. Norkin
%T Uniqueness of the $O$-curve along a direction that is analogous to the exceptional one
%J Differencialʹnye uravneniâ
%D 1975
%P 758-759
%V 11
%N 4
%I mathdoc
%U http://geodesic.mathdoc.fr/item/DE_1975_11_4_a21/
%G ru
%F DE_1975_11_4_a21