Cristian S. Calude José Félix Costa Rudolf Freund Marion Oswald Grzegorz Rozenberg Unconventional Computing, 7th International Conference, UC 2008, Vienna, Austria, August 25-28, 2008. Proceedings 5204 2008 978-3-540-85193-6 UC Lecture Notes in Computer Science Springer db/conf/uc/uc2008.html