S. Chakrabarti, M. Joshi, K. Punera, and D. Pennock. WWW '02: Proceedings of the 11th international conference on World Wide Web, page 251--262. New York, NY, USA, ACM Press, (2002)
R. Hammwöhner. The Social Semantic Web 2007 - Proceedings of the 1st Conference on Social Semantic Web, Bonn, Universit\ät Leipzig, Germany, Gesellschaft f\ür Informatik, (2007)
R. Snow, D. Jurafsky, and A. Ng. ACL '06: Proceedings of the 21st International Conference on Computational Linguistics and the 44th annual meeting of the ACL, page 801--808. Morristown, NJ, USA, Association for Computational Linguistics, (2006)