@inproceedings{verburg-1969-hobbes,
    title = "{H}obbes' Calculus of Words",
    author = "Verburg, P. A.",
    booktitle = "{I}nternational {C}onference on {C}omputational {L}inguistics {COLING} 1969: Preprint No. 39",
    month = sep,
    year = "1969",
    address = {S{\r{a}}nga S{\"a}by, Sweden},
    url = "https://aclanthology.org/C69-3901/"
}