@article{10_4064_ap_49_1_1_16,
     author = {C. Rousseau and D. Schlomiuk},
     title = {Generalized {Hopf} bifurcations and applications to planar quadratic systems},
     journal = {Annales Polonici Mathematici},
     pages = {1--16},
     publisher = {mathdoc},
     volume = {49},
     number = {1},
     year = {1988},
     doi = {10.4064/ap-49-1-1-16},
     language = {en},
     url = {http://geodesic.mathdoc.fr/articles/10.4064/ap-49-1-1-16/}
}