1. J. Dixmier, Les Algebres d'Operateurs dans l'Espace Hilbertien (Les Algebres de von Neumann), Paris (1957).
2. J. Dixmier, Les C*-Algebres et leurs Representations, Paris (1964).
3. M. A. Naimark, Normed Rings, Groningen (1960) [The page numbers quoted in the text refer to the later Russian edition (Nauka, 1968)].
4. R. V. Kadison, Trans. Amer. Math. Soc.,103, 304 (1962).
5. A. S. Wightman and R. F. Streater, PCT, Spin and Statistics and All That, Benjamin, New York (1964).