@inproceedings{liao-grishman-2011-document, title = "Can Document Selection Help Semi-supervised Learning? A Case Study On Event Extraction", author = "Liao, Shasha and Grishman, Ralph", editor = "Lin, Dekang and Matsumoto, Yuji and Mihalcea, Rada", booktitle = "Proceedings of the 49th Annual Meeting of the Association for Computational Linguistics: Human Language Technologies", month = jun, year = "2011", address = "Portland, Oregon, USA", publisher = "Association for Computational Linguistics", url = "https://preview.aclanthology.org/fix-sig-urls/P11-2045/", pages = "260--265" }