@inproceedings{appelo-etal-1987-subgrammars,
    title = "Subgrammars, Rule Classes and Control in the {R}osetta Translation System",
    author = "Appelo, Lisette  and
      Fellinger, Carel  and
      Landsbergen, Jan",
    editor = "Maegaard, Bente",
    booktitle = "Third Conference of the {E}uropean Chapter of the Association for Computational Linguistics",
    month = apr,
    year = "1987",
    address = "Copenhagen, Denmark",
    publisher = "Association for Computational Linguistics",
    url = "https://preview.aclanthology.org/fix-sig-urls/E87-1022/"
}