C. Kemp, and K. Ramamohanarao. Proceedings of the 6th European Conference on Principles
of Data Mining and Knowledge Discovery (PKDD 2002), page 263--274. Berlin, Springer, (2002)
Y. Sure, S. Staab, and J. Angele. Proceedings of the International Conference on Ontologies,
Databases and Applications of SEmantics ODBASE 2002, University of California, Irvine, USA, (2002)
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)