D. Shen, J. Sun, Q. Yang, and Z. Chen. WWW '06: Proceedings of the 15th international conference on World Wide Web, page 643--650. New York, NY, USA, ACM Press, (2006)
R. Cilibrasi, and P. Vitany. Theory of Evolutionary Algorithms, 06061, Dagstuhl, Germany, Internationales Begegnungs- und Forschungszentrum fuer
Informatik (IBFI), Schloss Dagstuhl, Germany, (5-10 February 2006)$<$http://drops.dagstuhl.de/opus/volltexte/2006/598$>$
date of citation: 2006-01-01.
D. Beeferman, and A. Berger. Proceedings of the sixth ACM SIGKDD international conference on Knowledge discovery and data mining, page 407--416. ACM Press, (2000)
Q. Miao, Q. Li, and R. Dai. Proceeding of the 17th ACM conference on Information and knowledge management, page 1369--1370. New York, NY, USA, ACM, (2008)