%0 Journal Article
%A E. A. Nazarov
%T Conditions for the existence of periodic trajectories in dynamic systems with cylindrical phase space
%J Differencialʹnye uravneniâ
%D 1970
%P 377-380
%V 6
%N 2
%I mathdoc
%U http://geodesic.mathdoc.fr/item/DE_1970_6_2_a18/
%G ru
%F DE_1970_6_2_a18