1. Ph. A. Martin,Modèles en Mécanique Statistique des Processus Irréversibles, Lecture Notes in Physics (Springer-Verlag, Berlin, 1979), Vol. 103, Chap. III.
2. E. B. Davies,Quantum Theory of Open Systems(Academic, London, 1976), Chap. 10.
3. M. Reed and B. Simon,Methods of Modern Mathematical Physics I: Functional Analysis(Academic, New York, 1972).
4. On quantum dynamical semigroups