J. Ahn, P. Brusilovsky, D. He, J. Grady, and Q. Li. Proceedings of the 17th international conference on World Wide Web, page 1--10. New York, NY, USA, ACM, (2008)
J. Ahn, P. Brusilovsky, D. He, J. Grady, and Q. Li. WWW '08: Proceeding of the 17th international conference on World Wide Web, page 1--10. New York, NY, USA, ACM, (2008)