Selim G. Akl Cristian S. Calude Michael J. Dinneen Grzegorz Rozenberg Todd Wareham Unconventional Computation, 6th International Conference, UC 2007, Kingston, Canada, August 13-17, 2007, Proceedings UC Lecture Notes in Computer Science 4618 Springer 2007 978-3-540-73553-3 db/conf/uc/uc2007.html