Jakob Grue Simonsen On the Computability of the Topological Entropy of Subshifts. 83-96 2006 8 Discrete Mathematics & Theoretical Computer Science 1 http://www.dmtcs.org/dmtcs-ojs/index.php/dmtcs/article/view/456 db/journals/dmtcs/dmtcs8.html#Simonsen06