@inproceedings{grishman-1989-natural,
    title = "Natural Language Understanding",
    author = "Grishman, Ralph",
    booktitle = "Speech and Natural Language: Proceedings of a Workshop Held at Philadelphia, {P}ennsylvania, {F}ebruary 21-23, 1989",
    year = "1989",
    url = "https://aclanthology.org/H89-1033/"
}