J. Lee, K. Lee, and W. Kim. Proceedings of the 2001 IEEE International Conference on Data
Mining, 29 November - 2 December 2001, San Jose, California,
USA, page 345-352. IEEE Computer Society, (2001)
B. Mobasher, H. Dai, T. Luo, Y. Sun, and J. Zhu. Proceedings of the
International Conference on E-Commerce and Web Technologies (ECWeb2000), page 165--176. Greenwich, UK, (2000)
A. Williams, and C. Tsatsoulis. Proceedings of the First Workshop on Ontology Learning
OL'2000, Berlin, Germany, Fourteenth European Conference on Artificial Intelligence, (2000)