@proceedings{coling-1969-international-linguistics-coling-1969-preprint-61,
    title = "{I}nternational {C}onference on {C}omputational {L}inguistics {COLING} 1969: Preprint No. 61",
    month = sep,
    year = "1969",
    address = {S{\r{a}}nga S{\"a}by, Sweden},
    url = "https://preview.aclanthology.org/volume-fixes/C69-6100/"
}
@inproceedings{varga-1969-problem,
    title = "Problem of Improving the Efficiency of Parsing Systems",
    author = "Varga, D.",
    booktitle = "{I}nternational {C}onference on {C}omputational {L}inguistics {COLING} 1969: Preprint No. 61",
    month = sep,
    year = "1969",
    address = {S{\r{a}}nga S{\"a}by, Sweden},
    url = "https://preview.aclanthology.org/volume-fixes/C69-6101/"
}