C. Yao, Y. Yu, S. Shou, and X. Li. WWW '08: Proceeding of the 17th international conference on World Wide Web, page 999--1008. New York, NY, USA, ACM, (2008)
R. Goldman, and J. Widom. In Proceedings of the Workshop on Query Processing for Semistructured Data and Non-Standard Data Formats, 97, page 436--445. (1999)
M. Garofalakis, A. Gionis, R. Rastogi, S. Seshadri, and K. Shim. SIGMOD '00: Proceedings of the 2000 ACM SIGMOD international conference on Management of data, 29, page 165--176. New York, NY, USA, ACM Press, (June 2000)