See, for instance:W. E. Thikring:Principles of Quantum Electrodynamics (New York 1958).
A. S. Wightman:La Théorie Quantique Locale et la Théorie Quantique des Chiamps, Annales de l’Institut Henri Poincaré, to appear.
See:A. S. Wightman andL. G-åeding:Fields as Operator-Valued Distributions, preprint, Princeton University.
Stated asTheorem 4-3, p. 139, in:R. P. Steeatee andA. S. Wightman:POT, Spin and Statistics, and All That (New York, Amsterdam, 1964), where other references are given.
D. Ruelle:Helv. Phys. Aeta,35, 147 (1962).
H. J. Borchers:Fields as C∞ Functions in Space-like Directions, preprint I.H.E.S.
O. E. Lanfoed: private communication.