1. Successive bifurcations at infinity for second order O.D.E.’s

   • Marco Sabatini

   OriginalPaper Pages: 1 - 17

2. Some remarks about the integration of polynomial planar vector fields

   • Jean Moulin Ollagnier

   OriginalPaper Pages: 19 - 28

3. Limit cycles for planar piecewise linear differential systems via first integrals

   • Jaume Llibre
   • Eduardo Nuñez
   • Antonio E. Teruel

   OriginalPaper Pages: 29 - 50

4. A pseudo-normal form for planar vector fields

   • Amadeu Delshams
   • Antoni Guillamon
   • J. Tomás Lázaro

   OriginalPaper Pages: 51 - 82

5. Periodic perturbations of an isochronous center

   • Rafael Ortega

   OriginalPaper Pages: 83 - 91

6. On the geometric structure of the class of planar quadratic differential systems

   • Robert Roussarie
   • Dana Schlomiuk

   OriginalPaper Pages: 93 - 121

7. Finite cyclicity of elementary graphics surrounding a focus or center in quadratic systems

   • F. Dumortier
   • A. Guzmán
   • C. Rousseau

   OriginalPaper Pages: 123 - 154

8. On the period function of centers in planar polynomial hamiltonian systems of degree four

   • Xavier Jarque
   • Jordi Villadelprat

   OriginalPaper Pages: 157 - 180

9. Balanced coordinates for spiraling dynamics

   • Fernando Sanz

   OriginalPaper Pages: 181 - 226

10. Structurally stable discontinuous vector fields in the plane

    • Jorge Sotomayor
    • Ana Lúcia F. Machado

    OriginalPaper Pages: 227 - 250

11. Geometry of cycles in quadratic systems

    • Douglas S. Shafer
    • André Zegeling

    OriginalPaper Pages: 251 - 274

12. Period function for perturbed isochronous centres

    • Emilio Freire
    • Armengol Gasull
    • Antoni Guillamon

    OriginalPaper Pages: 275 - 284