Confirmed Knowledge Acquisition Using Mails Posted to a Mailing List Yasuhiko Watanabe author Ryo Nishimura author Yoshihiro Okada author 2005 text Second International Joint Conference on Natural Language Processing: Full Papers conference publication watanabe-etal-2005-confirmed 10.1007/11562214_12 https://aclanthology.org/I05-1012/ 2005