%0 Journal Article
%A L. A. Cherkas
%A V. A. Gaǐko
%T Bifurcations of limit cycles of a quadratic system with two singular points and two parameters that rotate the field
%J Differencialʹnye uravneniâ
%D 1987
%P 1544-1553
%V 23
%N 9
%I mathdoc
%U http://geodesic.mathdoc.fr/item/DE_1987_23_9_a8/
%G ru
%F DE_1987_23_9_a8