1. N. Dunford and J. T. Schwartz,Linear Operators I, (Chapter 8), N. Y., 1958.
2. P. Halmos,Lectures on Ergodic Theory, The Mathematical Society of Japan, Tokyo, 1956.
3. A. A. Kirillov,Dynamical systems, factors and group representations, Uspehi Mat. Nauk22 (1967), 67–80.
4. W. Krieger,On entropy and generators of measure-preserving transformations, TAMS149 (1970), 453–464.
5. D. S. Ornstein,Bernoulli shifts with the same entropy are isomorphic, Advances in Math.4 (1970), 337–352.