Integrability in planar systems and existence of limit cycle in the generalized Rayleigh...

Centers and isochronicity of some polynomial differential systems

The center focus problem for planar nilpotent singularities

Invariant curves on differential systems defined in Rn, n ≥ 2

Geometrical and topological investigation of some families of quadratic differential...

Global study of planar polinomial systems on the Poincaré disk

Geometry in the middle school: learning geometry through constructions with ruler...

On the phase portraits of quadratic polynomial vector fields having a rational first...

The geometry of some tridimensional families of planar quadratic differential sy...

Two methods for the investigation of limit cycles wich bifurcate from centers