Q. Zhao, S. Bhowmick, X. Zheng, and K. Yi. CIKM '08: Proceeding of the 17th ACM conference on Information and knowledge management, page 309--318. New York, NY, USA, ACM, (2008)
L. Zhao, and M. Zaki. SIGMOD '05: Proceedings of the 2005 ACM SIGMOD international conference on Management of data, page 694--705. New York, NY, USA, ACM, (2005)
Q. Zhao, S. Bhowmick, X. Zheng, and K. Yi. CIKM '08: Proceeding of the 17th ACM conference on Information and knowledge management, page 309--318. New York, NY, USA, ACM, (2008)