%0 Journal Article
%A S. Yu. Pilyugin
%T Cycles in phase portraits of Morse--Smale systems
%J Differencialʹnye uravneniâ
%D 1977
%P 874-882
%V 13
%N 5
%I mathdoc
%U http://geodesic.mathdoc.fr/item/DE_1977_13_5_a9/
%G ru
%F DE_1977_13_5_a9