Passage Retrieval for Information Extraction using Distant Supervision Wei Xu author Ralph Grishman author Le Zhao author 2011-11 text Proceedings of 5th International Joint Conference on Natural Language Processing Haifeng Wang editor David Yarowsky editor Asian Federation of Natural Language Processing Chiang Mai, Thailand conference publication xu-etal-2011-passage https://aclanthology.org/I11-1117/ 2011-11 1046 1054