Topic Indexing and Retrieval for Factoid QA Kisuh Ahn author Bonnie Webber author 2008-08 text Coling 2008: Proceedings of the 2nd workshop on Information Retrieval for Question Answering Mark A Greenwood editor Coling 2008 Organizing Committee Manchester, UK conference publication ahn-webber-2008-topic https://aclanthology.org/W08-1809/ 2008-08 66 73