@article{grimes-1978-topic,
    title = "Topic Levels",
    author = "Grimes, Joseph E.",
    editor = "Hays, David G.",
    journal = "American Journal of Computational Linguistics",
    month = dec,
    year = "1978",
    note = "Microfiche 79",
    url = "https://preview.aclanthology.org/fix-sig-urls/J78-3021/",
    pages = "11--15"
}