A. Gangemi, A. Gliozzo, and V. Presutti. Proceedings of the 6th International Semantic Web Conference and 2nd Asian Semantic Web Conference (ISWC/ASWC2007), Busan, South Korea, volume 4825 of LNCS, page 757--770. Berlin, Heidelberg, Springer Verlag, (November 2007)
Y. Gil, and V. Ratnakar. Proceedings of the 15th International Florida Artificial Intelligence Research Society Conference, page 413--418. Menlo Park, CA, AAAI Press, (2002)
V. Petricek, I. Cox, H. Han, I. Councill, and C. Giles. volume 3652 NCS of Lecture Notes in Computer Science (including subseries Lecture Notes in Artificial Intelligence and Lecture Notes in Bioinformatics), page 438-449. Vienna, Austria, Springer Verlag, Heidelberg, D-69121, Germany, (2005)
B. Adler, and L. de Alfaro. WWW '07: Proceedings of the 16th international conference on World Wide Web, page 261-270. New York, NY, USA, ACM Press, (2007)