@inproceedings{braun-1969-formal,
    title = "Some formal properties of phonological redundancy rules",
    author = "Braun, Stephan",
    booktitle = "{I}nternational {C}onference on {C}omputational {L}inguistics {COLING} 1969: Preprint No. 6",
    month = sep,
    year = "1969",
    address = {S{\r{a}}nga S{\"a}by, Sweden},
    url = "https://preview.aclanthology.org/fix-sig-urls/C69-0601/"
}