X. Wei, and B. Croft. SIGIR '06: Proceedings of the 29th annual international ACM SIGIR conference on Research and development in information retrieval, page 178--185. New York, NY, USA, ACM Press, (2006)
G. Weikum. SIGMOD '07: Proceedings of the 2007 ACM SIGMOD international conference on Management of data, page 25--30. New York, NY, USA, ACM Press, (2007)
S. Wong, W. Ziarko, and P. Wong. SIGIR '85: Proceedings of the 8th annual international ACM SIGIR conference on Research and development in information retrieval, page 18--25. New York, NY, USA, ACM Press, (1985)
F. Xia, T. Liu, J. Wang, W. Zhang, and H. Li. Proceedings of the 25th international conference on Machine learning, page 1192--1199. New York, NY, USA, ACM, (2008)
E. Yilmaz, and J. Aslam. CIKM '06: Proceedings of the 15th ACM international conference on Information and knowledge management, page 102--111. New York, NY, USA, ACM, (2006)
M. Zacher. Information technologies and global politics: The changing scope of power and governance, State University of New York Press, Albany, (2002)
L. Zhang, Q. Liu, J. Zhang, H. Wang, Y. Pan, 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 645--658. Berlin, Heidelberg, Springer Verlag, (November 2007)
Q. Zhao, S. Hoi, T. Liu, S. Bhowmick, M. Lyu, and W. Ma. WWW '06: Proceedings of the 15th international conference on World Wide Web, page 543--552. New York, NY, USA, ACM Press, (2006)
Y. Zhou, and W. Croft. Proceedings of the 14th ACM International Conference on Information and Knowledge Management, page 331--332. New York, NY, USA, ACM, (2005)