Jiepu Jiang, James Allan. Necessary and frequent terms in queries. In Shlomo Geva, Andrew Trotman, Peter Bruza, Charles L. A. Clarke, Kalervo Järvelin, editors, The 37th International ACM SIGIR Conference on Research and Development in Information Retrieval, SIGIR '14, Gold Coast , QLD, Australia - July 06 - 11, 2014. pages 1167-1170, ACM, 2014. [doi]
Abstract is missing.