Y. Yanbe, A. Jatowt, S. Nakamura, and K. Tanaka. JCDL '07: Proceedings of the 7th ACM/IEEE-CS Joint Conference on Digital Libraries, page 107--116. New York, NY, USA, ACM, (2007)
P. Heymann, G. Koutrika, and H. Garcia-Molina. WSDM '08: Proceedings of the International Conference on Web Search and Web Data Mining, page 195--206. New York, NY, USA, ACM, (2008)