B. Pinkerton. Proceedings of the 2nd International World Wide Web, Volume 18(6) von Online & CDROM review: the international journal of, Medford, NJ, USA, Learned Information, (1994)
J. Ding, L. Gravano, und N. Shivakumar. Proceedings of the 26th Int. Conf. on Very Large Databases, VLDB 2000, Seite 545--556. Morgan Kaufmann Publishers Inc., (2000)