Rudolf Freund Fritz Tafill Cellular Automata and Parallel Array Systems. 311-327 2007 78 Fundam. Inform. 3 http://iospress.metapress.com/openurl.asp?genre=article&issn=0169-2968&volume=78&issue=3&spage=311 db/journals/fuin/fuin78.html#FreundT07