@article{MAN_1992__294_4_165009,
     author = {Jorge Hounie and Jos\'e R. dos Santos Filho},
     title = {Well posed {Cauchy} problems for complex nonlinear equations must be semilinear.},
     journal = {Mathematische Annalen},
     pages = {439--448},
     publisher = {mathdoc},
     volume = {294},
     number = {4},
     year = {1992},
     zbl = {0754.35084},
     url = {http://geodesic.mathdoc.fr/item/MAN_1992__294_4_165009/}
}