Learning surface text patterns for a Question Answering System Deepak Ravichandran author Eduard Hovy author 2002-07 text Proceedings of the 40th Annual Meeting of the Association for Computational Linguistics Pierre Isabelle editor Eugene Charniak editor Dekang Lin editor Association for Computational Linguistics Philadelphia, Pennsylvania, USA conference publication ravichandran-hovy-2002-learning 10.3115/1073083.1073092 https://aclanthology.org/P02-1006/ 2002-07 41 47