T. Nguyen, N. Kanhabua, C. Niederée, and X. Zhu. Proceedings of the 38th Annual International ACM SIGIR Conference on Research & Development on Information Retrieval, (2015)
M. Efron. Proceedings of the 36th international ACM SIGIR conference on Research and development in information retrieval, page 383--392. New York, NY, USA, ACM, (2013)
F. Raiber, and O. Kurland. Proceedings of the 36th international ACM SIGIR conference on Research and development in information retrieval, page 333--342. New York, NY, USA, ACM, (2013)