1. Geometrical Methods in the Theory of Differential Equations;Arnold,1988
2. Normal Forms and Bifurcation of Planar Vector Fields;Chow,1994
3. Techniques in the theory of local bifurcations: blow-up, normal forms, nilpotent bifurcations, singular perturbations;Dumortier,1993
4. Hilbert's 16th problem for quadratic systems and cyclicity of elementary graphics;Dumortier;, Nonlinearity,1996
5. Elementary graphics of cyclicity 1 and 2;Dumortier;Nonlinearity,1994