Jun-ichi Fukumoto, Tsuneaki Kato, Fumito Masui, Tatsunori Mori. An Overview of the 4th Question Answering Challenge (QAC-4) at NTCIR Workshop 6. In Noriko Kando, editor, Proceedings of the 6th NTCIR Workshop Meeting on Evaluation of Information Access Technologies: Information Retrieval, Question Answering and Cross-Lingual Information Access, NTCIR-6, National Center of Sciences, Tokyo, Japan, May 15-18, 2007. National Institute of Informatics (NII), 2007. [doi]
Abstract is missing.