@inproceedings{billot-lang-1989-structure,
    title = "The Structure of Shared Forests in Ambiguous Parsing",
    author = "Billot, Sylvie  and
      Lang, Bernard",
    booktitle = "27th Annual Meeting of the Association for Computational Linguistics",
    month = jun,
    year = "1989",
    address = "Vancouver, British Columbia, Canada",
    publisher = "Association for Computational Linguistics",
    url = "https://preview.aclanthology.org/fix-sig-urls/P89-1018/",
    doi = "10.3115/981623.981641",
    pages = "143--151"
}