M. Klein, A. Kiryakov, D. Ognyanoff, and D. Fensel. European Conference on Artificial Intelligence (ECAI)and Workshop
on Ontologies and Semantic Interoperability, (2002)
E. Meis, and R. Ostermayer. First Workshop on the Semantic Web at the Fourth European Conference
International Workshop on Research and Advanced Technology for Digital
Libraries, (1996)