@inproceedings{headden-iii-etal-2009-improving,
    title = "Improving Unsupervised Dependency Parsing with Richer Contexts and Smoothing",
    author = "Headden III, William P.  and
      Johnson, Mark  and
      McClosky, David",
    editor = "Ostendorf, Mari  and
      Collins, Michael  and
      Narayanan, Shri  and
      Oard, Douglas W.  and
      Vanderwende, Lucy",
    booktitle = "Proceedings of Human Language Technologies: The 2009 Annual Conference of the North {A}merican Chapter of the Association for Computational Linguistics",
    month = jun,
    year = "2009",
    address = "Boulder, Colorado",
    publisher = "Association for Computational Linguistics",
    url = "https://preview.aclanthology.org/ingest_wac_2008/N09-1012/",
    pages = "101--109"
}