Jun-ichi Fukumoto Tsuneaki Kato Fumito Masui An evaluation of question answering challenge (QAC-1) at the NTCIR workshop 3. 25-28 2004 38 SIGIR Forum 1 http://doi.acm.org/10.1145/986278.986283 db/journals/sigir/sigir38.html#FukumotoKM04