Document Image Retrieval in a Question Answering System for Document Images. - Koichi Kise; Shota Fukushima; Keinosuke Matsumoto (Document Analysis Systems, 2004)

Document Image Retrieval for QA Systems Based on the Density Distributions of Successive Terms. - Koichi Kise; Shota Fukushima; Keinosuke Matsumoto (IEICE Trans. Inf. Syst., 2005)