@inproceedings{clark-weir-2001-class,
    title = "Class-Based Probability Estimation Using a Semantic Hierarchy",
    author = "Clark, Stephen  and
      Weir, David",
    booktitle = "Second Meeting of the North {A}merican Chapter of the Association for Computational Linguistics",
    year = "2001",
    url = "https://preview.aclanthology.org/fix-sig-urls/N01-1013/"
}