%0 Journal Article %A Messina, F. %T Local solvability for semilinear partial differential equations of constant strength. %J Rendiconti del seminario matematico %D 2003 %P 33-54 %V 61 %N 1 %I mathdoc %U http://geodesic.mathdoc.fr/item/RSM_2003__61_1_116637/ %G en %F RSM_2003__61_1_116637