@inproceedings{ramshaw-1991-three,
    title = "A Three-Level Model for Plan Exploration",
    author = "Ramshaw, Lance A.",
    booktitle = "29th Annual Meeting of the Association for Computational Linguistics",
    month = jun,
    year = "1991",
    address = "Berkeley, California, USA",
    publisher = "Association for Computational Linguistics",
    url = "https://preview.aclanthology.org/jlcl-multiple-ingestion/P91-1006/",
    doi = "10.3115/981344.981350",
    pages = "39--46"
}