Integrability, center, and cyclicity problems for planar analytical vector fields
Global dynamical aspects of Abel equations of the third kind
Bifurcation of Limit Cycles from Polycycles in Dynamical Systems
Qualitative theory of ordinary differential equations: integrability, periodic orb...
Continuous or piecewise smooth dynamical systems on 2 and 3 dimensional manifolds.
On limit cycles that bifurcates from a center in a planar polynomial system.