J. Hounie et P. Santiago, ON THE LOCAL SOLVABILITY OF SEMILINEAR EQUATIONS, Communications in partial differential equations, 20(9-10), 1995, pp. 1777-1789
We prove that complex semilinear equations whose linear principal part
satisfies condition (P) are locally solvable. This extends the local
solvability theorem of Beals and Fefferman to semilinear equations.