1. Eardley, D. M., Moncrief, V.: Commun. Math. Phys.
2. Segal, I.: J. Funct. Anal.33, 175 (1979)
3. The choice of function spaces made in Ref. [2] was subsequently amended in an erratum (J. Funct. Anal. (to appear)). A more complete treatment of the amended local existence argument has been given by Ginibre, J., Velo, G.: Commun. Math. Phys.82, 1–28 (1981);
4. See also their paper in Phys. Lett.99B, 405 (1981)
5. Jörgens, K.: Math. Z.77, 295 (1961)