An Upper Estimation for Topological Entropy of Diffeomorphisms. Feliks Przytycki (1980) Inventiones mathematicae
Approximating entropy of maps of the interval Louis Block, Ethan M. Coven (1989) Banach Center Publications
Approximation for the invariant measures of Markov maps in Rd. Piotr Bugiel (1996) Mathematische Zeitschrift
Area preserving twist homeomorphism of the annulus. John N. Mather (1979) Commentarii mathematici Helvetici
Asymptotically Brownian skew products give non-loosely Bernoulli K-automorphisms. Daniel J. Rudolph (1988) Inventiones mathematicae