Dulac's Problem and of the Focus Center on Two-Dimensional Manifolds
Lower bounds for local cyclicity for Kolmogorov systems on planar piecewise vector...
On limit cycles in piecewise linear vector fields with algebraic discontinuity var...
Limit cycles for piecewise smooth dynamical systems in dimension n>2 and in compac...
Piecewise holomorphic systems and regularization of Filippov systems
Limit cycles, regularization and period function of piecewise smooth planar systems.