@inproceedings{nn-1990-penman,
    title = "The Penman Natural Language Project",
    booktitle = "Speech and Natural Language: Proceedings of a Workshop Held at Hidden Valley, {P}ennsylvania, June 24-27,1990",
    year = "1990",
    url = "https://preview.aclanthology.org/fix-sig-urls/H90-1102/"
}