M. Klein, D. Fensel, A. Kiryakov, and D. Ognyanov. Proc. of the 13th European Conf. on Knowledge Engineering and Knowledge Management (EKAW02) (Siguenza, Spain), page 197--212. (2002)
J. Heflin, and J. Hendler. Proceedings of the Seventeenth National Conference on Artificial Intelligence (AAAI-2000), page 443--449. AAAI/MIT Press, Menlo Park, CA, (2000)
L. Specia, and E. Motta. Proceedings of the European Semantic Web Conference (ESWC2007), volume 4519 of LNCS, page 624-639. Berlin Heidelberg, Germany, Springer-Verlag, (July 2007)
H. Wu, M. Zubair, and K. Maly. HYPERTEXT '06: Proceedings of the seventeenth conference on Hypertext and hypermedia, page 111--114. New York, NY, USA, ACM Press, (2006)