F. Abel, N. Henze, and D. Krause. Proceedings of the 17th ACM Conference on Information and Knowledge Management, CIKM 2008, Napa Valley, California, USA, October 26-30, 2008, page 1429-1430. ACM, (2008)
E. Agichtein, E. Brill, and S. Dumais. Proceedings of the 29th annual international ACM SIGIR conference on Research and development in information retrieval, page 19--26. New York, NY, USA, ACM, (2006)
E. Agichtein, E. Brill, S. Dumais, and R. Ragno. SIGIR '06: Proceedings of the 29th annual international ACM SIGIR conference on Research and development in information retrieval, page 3--10. New York, NY, USA, ACM, (2006)