@inproceedings{persing-ng-2009-semi,
    title = "Semi-Supervised Cause Identification from Aviation Safety Reports",
    author = "Persing, Isaac  and
      Ng, Vincent",
    editor = "Su, Keh-Yih  and
      Su, Jian  and
      Wiebe, Janyce  and
      Li, Haizhou",
    booktitle = "Proceedings of the Joint Conference of the 47th Annual Meeting of the {ACL} and the 4th International Joint Conference on Natural Language Processing of the {AFNLP}",
    month = aug,
    year = "2009",
    address = "Suntec, Singapore",
    publisher = "Association for Computational Linguistics",
    url = "https://preview.aclanthology.org/landing_page/P09-1095/",
    pages = "843--851"
}