@inproceedings{staudacher-1993-new,
    title = "New Frontiers Beyond Context-Freeness: Di-Grammars and Di-Automata.",
    author = "Staudacher, Peter",
    editor = "Krauwer, Steven  and
      Moortgat, Michael  and
      des Tombe, Louis",
    booktitle = "Sixth Conference of the {E}uropean Chapter of the Association for Computational Linguistics",
    month = apr,
    year = "1993",
    address = "Utrecht, The Netherlands",
    publisher = "Association for Computational Linguistics",
    url = "https://preview.aclanthology.org/fix-sig-urls/E93-1042/"
}