E. Spertus, M. Sahami, and O. Buyukkokten. Proceedings of the eleventh ACM SIGKDD international conference on Knowledge discovery in data mining, page 678--684. New York, NY, USA, ACM, (2005)
B. Markines, C. Cattuto, and F. Menczer. Proceedings of the 5th International Workshop on Adversarial Information Retrieval on the Web, page 41--48. New York, NY, USA, ACM, (2009)
P. Singla, and M. Richardson. WWW '08: Proceeding of the 17th international conference on World Wide Web, page 655--664. New York, NY, USA, ACM, (2008)
C. Ziegler, S. Mcnee, J. Konstan, and G. Lausen. WWW '05: Proceedings of the 14th international conference on World Wide Web, page 22--32. New York, NY, USA, ACM Press, (2005)