%0 Journal Article
%A E. A. Andronova
%T On~the topology of quadratic systems with four (or more) limit cycles
%J Trudy Matematicheskogo Instituta imeni V.A. Steklova
%D 1986
%P 191-192
%V 41
%N 2
%I mathdoc
%U http://geodesic.mathdoc.fr/item/RM_1986_41_2_a7/
%G en
%F RM_1986_41_2_a7