Identifying Event Descriptions using Co-training with Online News Summaries William Yang Wang author Kapil Thadani author Kathleen McKeown 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 wang-etal-2011-identifying https://aclanthology.org/I11-1032/ 2011-11 282 291