@inproceedings{marcus-1969-contextual, title = "Contextual Grammars", author = "Marcus, Solomon", booktitle = "{I}nternational {C}onference on {C}omputational {L}inguistics {COLING} 1969: Preprint No. 48", month = sep, year = "1969", address = {S{\r{a}}nga S{\"a}by, Sweden}, url = "https://preview.aclanthology.org/fix-sig-urls/C69-4801/" }