%0 Journal Article
%A I. V. Kamenev
%T Periodic solutions of first-order differential equations
%J Differencialʹnye uravneniâ
%D 1983
%P 1853-1859
%V 19
%N 11
%I mathdoc
%U http://geodesic.mathdoc.fr/item/DE_1983_19_11_a2/
%G ru
%F DE_1983_19_11_a2