@inproceedings{niu-hirst-2004-analysis,
    title = "Analysis of Semantic Classes in Medical Text for Question Answering",
    author = "Niu, Yun  and
      Hirst, Graeme",
    booktitle = "Proceedings of the Conference on Question Answering in Restricted Domains",
    month = jul,
    year = "2004",
    address = "Barcelona, Spain",
    publisher = "Association for Computational Linguistics",
    url = "https://preview.aclanthology.org/fix-sig-urls/W04-0509/",
    pages = "54--61"
}