%0 Journal Article
%A A. P. Vorob'ev
%T The cycles of a certain first order equation
%J Differencialʹnye uravneniâ
%D 1969
%P 1159-1166
%V 5
%N 7
%I mathdoc
%U http://geodesic.mathdoc.fr/item/DE_1969_5_7_a0/
%G ru
%F DE_1969_5_7_a0