%0 Journal Article %A S. S. Mamonov %T Determination of the number of limit cycles of the second kind of systems of differential equations %J Differencialʹnye uravneniâ %D 1988 %P 1076-1078 %V 24 %N 6 %I mathdoc %U http://geodesic.mathdoc.fr/item/DE_1988_24_6_a29/ %G ru %F DE_1988_24_6_a29