%0 Journal Article %A C. Rousseau %A D. Schlomiuk %T Generalized Hopf bifurcations and applications to planar quadratic systems %J Annales Polonici Mathematici %D 1988 %P 1-16 %V 49 %N 1 %I mathdoc %U http://geodesic.mathdoc.fr/articles/10.4064/ap-49-1-1-16/ %R 10.4064/ap-49-1-1-16 %G en %F 10_4064_ap_49_1_1_16