M. Zhou, S. Bao, X. Wu, und Y. Yu. Proceedings of the 6th International Semantic Web Conference and 2nd Asian Semantic Web Conference (ISWC/ASWC2007), Busan, South Korea, Volume 4825 von LNCS, Seite 680--693. Berlin, Heidelberg, Springer Verlag, (2007)
R. Li, S. Bao, Y. Yu, B. Fei, und Z. Su. WWW '07: Proceedings of the 16th international conference on World Wide Web, Seite 943--952. New York, NY, USA, ACM, (2007)