@inproceedings{petofi-1969-problems,
    title = "On the Problems of Co-Textual Analysis of Texts",
    author = "Petofi, Janos S.",
    booktitle = "{I}nternational {C}onference on {C}omputational {L}inguistics {COLING} 1969: Preprint No. 50",
    month = sep,
    year = "1969",
    address = {S{\r{a}}nga S{\"a}by, Sweden},
    url = "https://preview.aclanthology.org/fix-sig-urls/C69-5001/"
}