References and links
Kolmogorov entropy, mathworld.Wolfram.com, http://mathworld.wolfram.com/KolmogorovEntropy.html
Approximate entropy as a measure of system complexity, S M Pincus, http://www.pnas.org/content/88/6/2297.
Physiological time-series analysis using approximate entropy and sample entropy, Joshua S. Richman, J. Randall Moorman, American Journal of Physiology - Heart and Circulatory Physiology Published 1 June 2000 Vol. 278 no. 6, H2039-H2049, http://ajpheart.physiology.org/content/278/6/H2039
Multiscale Entropy Analysis of Complex Physiologic Time Series, Madalena Costa, Ary L. Goldberger, and C.-K. Peng Phys. Rev. Lett. 89, 068102 – Published 19 July 2002, http://journals.aps.org/prl/abstract/10.1103/PhysRevLett.89.068102
Multiscale entropy analysis of biological signals, Madalena Costa, Ary L. Goldberger, and C.-K. Peng Phys. Rev. E 71, 021906 – Published 18 February 2005, http://journals.aps.org/pre/abstract/10.1103/PhysRevE.71.021906