1. Billingsley, P., Ergodic Theory and Information (1965), Wiley, New York.
2. Feller, W., An Introduction to Probability Theory and Its Applications, Vol. II (1966), Wiley, New York.
3. Ornstein, D. S., Bernoulli shifts with the same entropy are isomorphic, to appear. (Advances in Math.)
4. Parry, W., Entropy and Generators in Ergodic Theory (1969), Benjamin, New York.
5. Friedman, N. and Ornstein, D. S., An isomorphism of weak Bernoulli transformations, to appear. (Advances in Math.)