%0 Journal Article
%A N. P. Morozov
%T Periodic solutions of the equation $\ddot x+\lambda f(ax+b\dot x)\dot x+x=0$
%J Differencialʹnye uravneniâ
%D 1986
%P 905-907
%V 22
%N 5
%I mathdoc
%U http://geodesic.mathdoc.fr/item/DE_1986_22_5_a29/
%G ru
%F DE_1986_22_5_a29