A Data Driven Approach to Query Expansion in Question Answering Leon Derczynski author Jun Wang author Robert Gaizauskas author Mark A Greenwood 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 derczynski-etal-2008-data https://aclanthology.org/W08-1805/ 2008-08 34 41