1. S. Horuzhy:Introduction in Algebraic Quantum Field Theory (Moscow, 1986).
2. H. Borchers:Physica A,124, 127 (1984).
3. N. Bogoliubov, A. Logunov, A. Oksak andI. Todorov:General Principles of Quantum Field Theory (Moscow, 1987).
4. I. Gel'fand andV. Vilenkin:Generalized Functions (New York, 1966).
5. J. Dixmier:Algèbres Enveloppantes (Paris, 1974).