%0 Journal Article
%A S. Yu. Pilyugin
%T Periodic trajectories and the structure of phase diagrams
%J Differencialʹnye uravneniâ
%D 1979
%P 1000-1006
%V 15
%N 6
%I mathdoc
%U http://geodesic.mathdoc.fr/item/DE_1979_15_6_a4/
%G ru
%F DE_1979_15_6_a4