Masaharu Yoshioka. Evaluating Topic Difficulties from the Viewpoint of Query Term Expansion. In Hwee Tou Ng, Mun-Kew Leong, Min-Yen Kan, Donghong Ji, editors, Information Retrieval Technology, Third Asia Information Retrieval Symposium, AIRS 2006, Singapore, October 16-18, 2006, Proceedings. Volume 4182 of Lecture Notes in Computer Science, pages 390-403, Springer, 2006. [doi]
Abstract is missing.