Y. Lin, Y. Chi, S. Zhu, H. Sundaram, and B. Tseng. WWW '08: Proceeding of the 17th international conference on World Wide Web, page 685--694. New York, NY, USA, ACM, (2008)
D. Zhou, X. Ji, H. Zha, and C. Giles. CIKM '06: Proceedings of the 15th ACM international conference on Information and knowledge management, page 248--257. New York, NY, USA, ACM, (2006)
D. Zhou, E. Manavoglu, J. Li, C. Giles, and H. Zha. WWW '06: Proceedings of the 15th international conference on World Wide Web, page 173--182. New York, NY, USA, ACM, (2006)