A. Lam-Adesina, and G. Jones. SIGIR '01: Proceedings of the 24th annual international ACM SIGIR conference on Research and development in information retrieval, page 1--9. New York, NY, USA, ACM Press, (2001)
I. Ruthven. SIGIR '03: Proceedings of the 26th annual international ACM SIGIR conference on Research and development in informaion retrieval, page 213--220. New York, NY, USA, ACM Press, (2003)
B. Tan, A. Velivelli, H. Fang, and C. Zhai. SIGIR '07: Proceedings of the 30th annual international ACM SIGIR conference on Research and development in information retrieval, page 263--270. New York, NY, USA, ACM Press, (2007)
J. Parikh, and S. Kapur. SIGIR '06: Proceedings of the 29th annual international ACM SIGIR conference on Research and development in information retrieval, page 689--690. New York, NY, USA, ACM Press, (2006)
J. Bai, D. Song, P. Bruza, J. Nie, and G. Cao. CIKM '05: Proceedings of the 14th ACM international conference on Information and knowledge management, page 688--695. New York, NY, USA, ACM Press, (2005)
E. Efthimiadis. SIGIR '93: Proceedings of the 16th annual international ACM SIGIR conference on Research and development in information retrieval, page 146--159. New York, NY, USA, ACM, (1993)
C. Buckley, G. Salton, and J. Allan. SIGIR '94: Proceedings of the 17th annual international ACM SIGIR conference on Research and development in information retrieval, page 292--300. New York, NY, USA, Springer-Verlag New York, Inc., (1994)
J. Xu, and B. Croft. Proceedings of the Nineteenth Annual International ACM SIGIR Conference on Research and Development in Information Retrieval, page 4--11. (1996)
B. Billerbeck, and J. Zobel. ADC '04: Proceedings of the 15th Australasian database conference, page 69--76. Darlinghurst, Australia, Australia, Australian Computer Society, Inc., (2004)