1. Abramov, L.M., On the entropy of a flow, Dokl. Akad. Nauk SSSR 128 (1959) 873–875.
2. Adler, R. and Marcus, B., Topological entropy and equivalence of dynamical systems, Mem. Amer. Math. Soc. 219 (1979).
3. Adler, R., Konheim, A.G. and Mc Andrew, M.H., Topological entropy, Trans. Amer. Soc. 114 (1965) 309–319.
4. Adler, R., and Weiss, B., Similarity of automorphisms of the torus, Mem. Amer. Math. Soc. No. 45 (1970).
5. Ambrose, W. and Kakutani, S., Structure and continuity of measurable flows, Duke Math. J. 9 (1942) 25–2.