1. Borchers, H. J.: On structure of the algebra of field operators. Nuovo Cimento24, 214 (1962).
2. Dimock, J., Glimm, J.: Measures on the Schwartz distribution space and applications to quantum field theory (to appear).
3. Dyson, F. J.: TheS matrix in quantum electrodynamics. Phys. Rev.75, 1736 (1949).
4. Feldman, J.: A relativistic Feynman-Kac formula. Harvard preprint (1972).
5. Gelfand, I. M., Shilov, G. E.: Generalized functions, Vol. 2. New York: Academic Press 1964.