@inproceedings{marcus-1969-contextual,
    title = "Contextual Grammars",
    author = "Marcus, Solomon",
    booktitle = "{I}nternational {C}onference on {C}omputational {L}inguistics {COLING} 1969: Preprint No. 48",
    month = sep,
    year = "1969",
    address = {S{\r{a}}nga S{\"a}by, Sweden},
    url = "https://preview.aclanthology.org/ingest-emnlp/C69-4801/"
}