Limit cycles, regularization and period function of piecewise smooth planar systems.
Period function and criticality in planar differential systems
Periodic solutions dor discontinuous dynamical systems with symmetry
Regularization of planar Filippov Systems near a codimension one singularity
Limit cycles for piecewise smooth dynamical systems in dimension n>2 and in compac...
Systems of partial differential equations and nonlinear elliptic equations