Bratteli, O. / Robinson, D. W., Operator Algebras and Quantum Statistical Mechanics. Vol. 1:C* andW*-algebras. Symmetry Groups. Decomposition of States. Texts and Monographs in Physics. Berlin-Heidelberg-New York, Springer-Verlag 1979. XII, 500 S., DM 68,–. US $ 37.40. ISBN 3-540-09187-4