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)
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)