%0 Journal Article %A V. P. Zakharov %A Yu. V. Malyshev %T Application of generalized Ljapunov functions to the study of limit cycles on the plane %J Differencialʹnye uravneniâ %D 1972 %P 2248-2250 %V 8 %N 12 %I mathdoc %U http://geodesic.mathdoc.fr/item/DE_1972_8_12_a18/ %G ru %F DE_1972_8_12_a18