1. O. Bratteli, ?On dynamical semigroups and compact group actions,? in: Quantum Stochastic Processes and Open Systems [Russian translation], Mir, Moscow (1988), pp. 180?196.
2. D. Robinson, Operator Algebras and Quantum Mechanics [Russian translation], Mir, Moscow (1982).
3. I. I. Gikhman and A. V. Skorokhod, Introduction to the Theory of Stochastic Processes [in Russian], Nauka, Moscow (1977).
4. T. Kato, Perturbation Theory for Linear Operators, Springer, Berlin (1966).
5. A. N. Kolmogorov and S. P. Novikov (eds.), Quantum Stochastic Processes and Open Systems [in Russian], Mir, Moscow (1988).