@inproceedings{costagliola-chang-1991-parsing,
    title = "Parsing 2-{D} Languages with Positional Grammars",
    author = "Costagliola, Gennaro  and
      Chang, Shi-Kuo",
    editor = "Tomita, Masaru  and
      Kay, Martin  and
      Berwick, Robert  and
      Hajicova, Eva  and
      Joshi, Aravind  and
      Kaplan, Ronald  and
      Nagao, Makoto  and
      Wilks, Yorick",
    booktitle = "Proceedings of the Second International Workshop on Parsing Technologies",
    month = feb # " 13-25",
    year = "1991",
    address = "Cancun, Mexico",
    publisher = "Association for Computational Linguistics",
    url = "https://aclanthology.org/1991.iwpt-1.27/",
    pages = "235--243"
}