Chordal cubic systems

M. Carbonell, J. Llibre
1989 Publicacions matemàtiques  
CHORDAL CUBIL SYSTEMS MARC CARBONELL AND JAUME LLIBRE We classify the phase portraits of the cubic systems in the plane such that they do not have finite critical points, and the critical points on the equator of the Poincaré sphere are isolated and have linear part nonidentically zero .
doi:10.5565/publmat_33289_07 fatcat:u3mdk5ngxbemnfhapij5ke5rxe