1. Haag, R., Kastler, D., Trych-Pohlmeyer, E.: Stability and equilibrium states. Commun. math. Phys.38, 173 (1974)
2. Kastler, D.: Equilibrium states of matter and operator algebras. In: Proceedings of the March 1975 Rome Conference “AlgebreC* e loro applicazioni in Fisica teorica”. Symp. Math.20, 49 (1976)
3. Wightman, A.: Some results of the structure of relativistic quantum field theory. In: Proceedings of the international congress of mathematicians. Uppsala: Almqvist & Wiksell 1963
4. Arveson, W.: On groups of automorphisms of operator algebras. J. Funct. Anal.15, 217 (1974)
5. Herman, R.: Invariant states. Trans. A.M.S.158, 503 (1971)