Planar Quadratic Vector Fields with
Finite Saddle Connection on a Straight Line (Convex Case) Paulo Cesar Carriao
Maria Elasir Seabra Gomes
Antonio Augusto Gaspar Ruas
We classify the phase portraits of planar quadratic vector fields with a
invariant straight line passing through two finite saddles, when the singularities
of the field form a convex quadrilateral.