H. Peter, H. Sack, and C. Beckstein. in Proc. of the 1st Semantic Authoring and Annotation Workshop (SAAW2006), Athens (GA), USA, (2006)location=Athens (GA), USA, date=2006.
J. Gemmell, G. Bell, R. Lueder, S. Drucker, and C. Wong. Proceedings of the tenth ACM international conference on Multimedia (MM-02), page 235--238. New York, ACM Press, (December 2002)