- (2002)
- CIKM '06: Proceedings of the 15th ACM international conference on Information and knowledge management, page 238--247. New York, NY, USA, ACM Press, (2006)
- Web Intelligence and Agent Systems 3(3):135--154 (January 2005)
- Web Intelligence and Agent Systems 1(3-4):249--257 (2003)
- WWW '07: Proceedings of the 16th international conference on World Wide Web, page 11--20. New York, NY, USA, ACM Press, (2007)
- WWW '07: Proceedings of the 16th international conference on World Wide Web, page 271--280. New York, NY, USA, ACM Press, (2007)
- WWW '08: Proceeding of the 17th international conference on World Wide Web, page 1--10. New York, NY, USA, ACM, (2008)
- Inf. Process. Manage. 44(2):511--533 (March 2008)


user