@inproceedings{pendergraft-1963-types,
    title = "Types of language hierarchy",
    author = "Pendergraft, E. D.",
    booktitle = "Proceedings of the Annual meeting of the Association for Machine Translation and Computational Linguistics",
    month = "25-26 " # aug,
    year = "1963",
    address = "Denver, Colorado",
    url = "https://preview.aclanthology.org/jlcl-multiple-ingestion/1963.earlymt-1.28/"
}