M. Mathioudakis, and N. Koudas. Proceedings of the 2010 ACM SIGMOD International Conference on Management of data, page 1155--1158. New York, NY, USA, ACM, (2010)
L. Gravano, P. Ipeirotis, N. Koudas, and D. Srivastava. Proc. of the 12th International Conference on World Wide Web - WWW'03, page 90--101. New York, NY, USA, ACM Press, (2003)
S. Guha, N. Koudas, A. Marathe, and D. Srivastava. Proceedings of the 30th International Conference on Very Large Databases (VLDB 2004), page 636-647. (2004)