@inproceedings{karlgren-1969-multi,
    title = "Multi-Index Syntactical Calculus",
    author = "Karlgren, Hans",
    booktitle = "{I}nternational {C}onference on {C}omputational {L}inguistics {COLING} 1969: Preprint No. 68",
    month = sep,
    year = "1969",
    address = {S{\r{a}}nga S{\"a}by, Sweden},
    url = "https://preview.aclanthology.org/landing_page/C69-6801/"
}