On the Relation of KS Entropy and Permutation Entropy
  Since Bandt et al. have shown that the permutation entropy and the Kolmogorov-Sinai entropy coincide for piecewise monotone interval maps, the relationship of both entropies for time-discrete dynamical systems is of a certain interest. The aim of this paper is a discussion of this relationship on the basis of an ordinal characterization of the Kolmogorov-Sinai entropy recently given. 
Karsten Keller, Anton M. Unakafov, Valentina A. Unakafova
nlin.CD math.DS