%0 Journal Article %A V. G. Romanovsky %T On the finiteness of the number of limit cycles in a quadratic system %J Differencialʹnye uravneniâ %D 1988 %P 1904-1911 %V 24 %N 11 %I mathdoc %U http://geodesic.mathdoc.fr/item/DE_1988_24_11_a7/ %G ru %F DE_1988_24_11_a7