%0 Journal Article %A M. V. Dolov %T The limit cycles of a certain class of differential equations %J Differencialʹnye uravneniâ %D 1969 %P 1330-1334 %V 5 %N 7 %I mathdoc %U http://geodesic.mathdoc.fr/item/DE_1969_5_7_a20/ %G ru %F DE_1969_5_7_a20