Z. Zheng, G. Webb, and K. Ting. Proceedings of the Tenth IEEE International Conference on Tools with Artificial Intelligence (ICTAI�98), page 216-223. Los Alamitos, CA, IEEE Computer Society Press, (1998)
Z. Zheng, and G. Webb. Lecture Notes in Computer Science Vol. 1502: Advanced Topics in Artificial Intelligence, Selected Papers from the Eleventh Australian Joint Conference on Artificial Intelligence (AI '98), page 321-332. Berlin, Springer-Verlag, (1998)