H. Kim, S. Scerri, J. Breslin, S. Decker, und H. Kim. Proceedings of the 2008 International Conference on Dublin Core and Metadata Applications, Seite 128--137. Berlin, Deutschland, Dublin Core Metadata Initiative, (2008)
X. Wu, L. Zhang, und Y. Yu. WWW '06: Proceedings of the 15th international conference on World Wide Web, Seite 417--426. New York, NY, USA, ACM Press, (2006)