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2. Doplicher, S., D. Kastler, andD. W. Robinson: Commun. Math. Phys.3, 1 (1966).
3. Ruelle, D.: Commun. Math. Phys.3, 133 (1966).
4. Dixmier, J.: Les algèbres d'opérateurs dans l'espace hilbertien (algèbres de vonNeumann). Chapter I, § 6, theorem 2. Paris: Gauthier-Villars 1957.
5. Ref. 4, chapter III, § 1, theorem 6.