Seung-Hoon Na In-Su Kang Yeha Lee Jong-Hyeok Lee Completely-Arbitrary Passage Retrieval in Language Modeling Approach. 22-33 2008 AIRS http://dx.doi.org/10.1007/978-3-540-68636-1_3 conf/airs/2008 db/conf/airs/airs2008.html#NaKLL08