P. Patel-Schneider, and J. Siméon. The Semantic Web - ISWC 2002: First International Semantic Web Conference, Sardinia, Italy, June 9-12, 2002. Proceedings, (2002)
O. Corby, R. Dieng, and C. H&\#233;bert. ICCS '00: Proceedings of the Linguistic on Conceptual Structures, page 468--482. London, UK, Springer-Verlag, (2000)