@inproceedings{litkowski-hargraves-2006-coverage,
    title = "Coverage and Inheritance in The Preposition Project",
    author = "Litkowski, Kenneth C.  and
      Hargraves, Orin",
    booktitle = "Proceedings of the Third {ACL}-{SIGSEM} Workshop on Prepositions",
    year = "2006",
    url = "https://preview.aclanthology.org/fix-sig-urls/W06-2106/"
}