Answering questions of Information Access Dialogue (IAD) task using ellipsis handling of follow-up questions Junichi Fukumoto author 2006-06 text Proceedings of the Interactive Question Answering Workshop at HLT-NAACL 2006 Nick Webb editor Association for Computational Linguistics New York, NY, USA conference publication fukumoto-2006-answering https://aclanthology.org/W06-3006/ 2006-06 41 48