%0 Journal Article %A V. V. Stolyarov %T Limit cycles and boundedness of a dynamical system %J Differencialʹnye uravneniâ %D 1989 %P 1823-1824 %V 25 %N 10 %I mathdoc %U http://geodesic.mathdoc.fr/item/DE_1989_25_10_a29/ %G ru %F DE_1989_25_10_a29