A Question Answer System Based on Confirmed Knowledge Developed by Using Mails Posted to a Mailing List Ryo Nishimura author Yasuhiko Watanabe author Yoshihiro Okada author 2005 text Companion Volume to the Proceedings of Conference including Posters/Demos and tutorial abstracts conference publication nishimura-etal-2005-question https://aclanthology.org/I05-2006/ 2005