C. Palmer, P. Gibbons, and C. Faloutsos. Proceedings of the eighth ACM SIGKDD international conference on Knowledge discovery and data mining, page 81--90. New York, NY, USA, ACM Press, (2002)
J. Leskovec, and C. Faloutsos. KDD '06: Proceedings of the 12th ACM SIGKDD international conference on Knowledge discovery and data mining, page 631--636. New York, NY, USA, ACM Press, (2006)