Jean-Charles Delvenne Petr Kurka Vincent D. Blondel Decidability and Universality in Symbolic Dynamical Systems. 463-490 2006 74 Fundam. Inform. 4 http://iospress.metapress.com/openurl.asp?genre=article&issn=0169-2968&volume=74&issue=4&spage=463 db/journals/fuin/fuin74.html#DelvenneKB06