A new class of Hardy spaces and microlocal analysis of traces of solutions of PDEs
Solvability and hypoellipticity of first order partial differential operators and...
Qualitative theory of differential equations in the plane: topological classificat...
Limit cycles, regularization and period function of piecewise smooth planar systems.
Planar phase portraits and generic bifurcations of reversible vector fields
Solvability for a class of first-order partial differential operators
Vector fields, sums of squares and Bers-Vekua equations: existence and regularity ...