@inproceedings{penn-1997-head,
    title = "Head-Driven Generation and Indexing in {ALE}",
    author = "Penn, Gerald",
    booktitle = "Computational Environments for Grammar Development and Linguistic Engineering",
    year = "1997",
    url = "https://preview.aclanthology.org/fix-sig-urls/W97-1509/"
}