1. Versal unfoldings for rank-2 singularities of positive quadratic differential forms

   • V. Guíñez
   • E. Sáez

   OriginalPaper Pages: 285 - 307

2. Topological equivalence for saddle connections

   • Clementa Alonso

   OriginalPaper Pages: 309 - 324

3. A polynomial bound for the lap number

   • Mathieu Baillif

   OriginalPaper Pages: 325 - 329

4. Center conditions for a lopsided quintic polynomial vector field

   • Roland Pons
   • Nazim Salih

   OriginalPaper Pages: 331 - 343

5. Some lower bounds forH(n) in Hilbert’s 16th problem

   • Jibin Li
   • H. S. Y. Chan
   • K. W. Chung

   OriginalPaper Pages: 345 - 360

6. About homotopy classes of non-singular vector fields on the three-sphere

   • Emmanuel Dufraine

   OriginalPaper Pages: 361 - 376

7. Computing simplest normal forms for the Takens-Bogdanov singularity

   • Antonio Algaba
   • Emilio Freire
   • Estanislao Gamero

   OriginalPaper Pages: 377 - 435

8. On the distribution and number of limit cycles for quadratic systems with two foci

   • Zhang Pingguang

   OriginalPaper Pages: 437 - 463