%0 Journal Article %A Jorge Hounie %A José R. dos Santos Filho %T Well posed Cauchy problems for complex nonlinear equations must be semilinear. %J Mathematische Annalen %D 1992 %P 439-448 %V 294 %N 4 %I mathdoc %U http://geodesic.mathdoc.fr/item/MAN_1992__294_4_165009/ %F MAN_1992__294_4_165009