G. Webb, and J. Wells. Proceedings of the Eighth Australian Joint Conference on Artificial Intelligence (AI'95), page 291-298. Singapore, World Scientific, (1995)
G. Webb. Lecture Notes in Computer Science Vol. 2256: Proceedings of the 14th Australian Joint Conference on Artificial Intelligence (AI'01), page 545-556. Berlin/Heidelberg, Springer, (2001)
G. Webb. Proceedings (Complement) of the Seventh European Workshop on Knowledge Acquisition for Knowledge-based Systems (EWKA'93), page 263-275. Springer-Verlag, (1993)