B. He, R. Wang, Y. Chen, A. Lelescu, and J. Rhodes. SIGMOD '07: Proceedings of the 2007 ACM SIGMOD international conference on Management of data, page 1041--1052. New York, NY, USA, ACM, (2007)
R. Fang, B. He, M. Lu, K. Yang, N. Govindaraju, Q. Luo, and P. Sander. SIGMOD '07: Proceedings of the 2007 ACM SIGMOD international conference on Management of data, page 1061--1063. New York, NY, USA, ACM, (2007)