@inproceedings{christensen-etal-2009-onyx,
    title = "{ONYX}: A System for the Semantic Analysis of Clinical Text",
    author = "Christensen, Lee  and
      Harkema, Henk  and
      Haug, Peter  and
      Irwin, Jeannie  and
      Chapman, Wendy",
    editor = "Cohen, K. Bretonnel  and
      Demner-Fushman, Dina  and
      Ananiadou, Sophia  and
      Pestian, John  and
      Tsujii, Jun{'}ichi  and
      Webber, Bonnie",
    booktitle = "Proceedings of the {B}io{NLP} 2009 Workshop",
    month = jun,
    year = "2009",
    address = "Boulder, Colorado",
    publisher = "Association for Computational Linguistics",
    url = "https://preview.aclanthology.org/fix-sig-urls/W09-1303/",
    pages = "19--27"
}