%0 Journal Article
%A Josef Hainzl
%T On the number of limit cycles in perturbations of a two dimensional nonlinear differential system.
%J Aequationes mathematicae
%D 1997
%P 254-274
%V 53
%N 1-2
%I mathdoc
%U http://geodesic.mathdoc.fr/item/AM2_1997__53_1-2_137687/
%F AM2_1997__53_1-2_137687