%0 Journal Article
%A A. A. Kadirov
%T Singular points of differential equations with nonoriented trajectories on a plane
%J Differencialʹnye uravneniâ
%D 1983
%P 2039-2048
%V 19
%N 12
%I mathdoc
%U http://geodesic.mathdoc.fr/item/DE_1983_19_12_a2/
%G ru
%F DE_1983_19_12_a2