%0 Journal Article
%A E. A. Andronova
%T Partition of the parameter space of a quadratic system with a triple focus or a center at the origin
%J Differencialʹnye uravneniâ
%D 1998
%P 441-450
%V 34
%N 4
%I mathdoc
%U http://geodesic.mathdoc.fr/item/DE_1998_34_4_a1/
%G ru
%F DE_1998_34_4_a1