Koichi Kise Shota Fukushima Keinosuke Matsumoto Document Image Retrieval in a Question Answering System for Document Images. 521-532 http://dx.doi.org/10.1007/978-3-540-28640-0_49 2004 conf/das/2004 Document Analysis Systems db/conf/das/das2004.html#KiseFM04