H. Juille, and J. Pollack. Proceedings of the Fifteenth National Conference on
Artificial Intelligence (AAAI-98) Tenth Conference on
Innovative Applications of Artificial Intelligence
(IAAI-98), Madison, Wisconsin, USA, AAAI Press Books, (26-30 July 1998)
R. van Engelen, J. Birch, Y. Shou, B. Walsh, and K. Gallivan. ICS '04: Proceedings of the 18th annual international conference on Supercomputing, page 106--115. New York, NY, USA, ACM Press, (2004)