Analytic hypoellipticity and local solvability for a class of pseudo-differevtial poerators with Symplectic Characteristics, “Singulrities and Differential Equations”. Banach Center Publications. 1996. 33. 315-335
Analytic hypoellipticity and local solvability for a class of pseudo-differevtial poerators with Symplectic Characteristics, “Singulrities and Differential Equations”. Banach Center Publications. 1996. 33. 315-335