D. Gruhl, R. Guha, D. Nowell, and A. Tomkins. Proceedings of the 13th international conference on World Wide Web, page 491--501. New York, NY, USA, ACM, (2004)
R. Kumar, J. Novak, P. Raghavan, and A. Tomkins. WWW '03: Proceedings of the twelfth international conference on World Wide Web, page 568--576. ACM Press, (2003)
D. Gruhl, R. Guha, R. Kumar, J. Novak, and A. Tomkins. KDD '05: Proceeding of the eleventh ACM SIGKDD international conference on Knowledge discovery in data mining, page 78--87. New York, NY, USA, ACM Press, (2005)
R. Kumar, J. Novak, and A. Tomkins. KDD '06: Proceedings of the 12th ACM SIGKDD international conference on Knowledge discovery and data mining, page 611--617. New York, NY, USA, ACM Press, (2006)