Bernardo Magnini Matteo Negri Roberto Prevete Hristo Tanev Is It the Right Answer? Exploiting Web Redundancy for Answer Validation. 425-432 2002 conf/acl/2002 ACL http://www.aclweb.org/anthology/P02-1054.pdf db/conf/acl/acl2002.html#MagniniNPT02