M. Zhou, S. Bao, X. Wu, and Y. Yu. Proceedings of the 6th International Semantic Web Conference and 2nd Asian Semantic Web Conference (ISWC/ASWC2007), Busan, South Korea, volume 4825 of LNCS, page 673--686. Berlin, Heidelberg, Springer Verlag, (November 2007)
M. Zhou, S. Bao, X. Wu, and Y. Yu. Proceedings of the 6th International Semantic Web Conference and 2nd Asian Semantic Web Conference (ISWC/ASWC2007), Busan, South Korea, volume 4825 of LNCS, page 673--686. Berlin, Heidelberg, Springer Verlag, (November 2007)