K. Liu, B. Fang, and W. Zhang. Proceedings of the 19th ACM International Conference on Information and Knowledge Management, page 1109--1118. New York, NY, USA, ACM, (2010)
H. Kim, S. Scerri, J. Breslin, S. Decker, and H. Kim. Proceedings of the 2008 International Conference on Dublin Core and Metadata Applications, page 128--137. Berlin, Deutschland, Dublin Core Metadata Initiative, (2008)