Persistence of Crandall-Rabinowitz type bifurcations under small perturbations.
Perturbations of quadratic hamiltonian systems with symmetry
Phase portraits of planar vector fields: Computer proofs.
Pseudo-abelian integrals on slow-fast Darboux systems
We study pseudo-abelian integrals associated with polynomial deformations of slow-fast Darboux integrable systems. Under some assumptions we prove local boundedness of the number of their zeros.