@inproceedings{wittenburg-1991-parsing,
    title = "Parsing with Relational Unification Grammars",
    author = "Wittenburg, Kent",
    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://preview.aclanthology.org/ingest-emnlp/1991.iwpt-1.26/",
    pages = "225--234",
    abstract = "In this paper we present a unification-based grammar formalism and parsing algorithm for the purposes of defining and processing non-concatenative languages. In order to encompass languages that are characterized by relations beyond simple string concatenation, we introduce relational constraints into a linguistically-based unification grammar formalism and extend bottom-up chart parsing methods. This work is currently being applied in the interpretation of hand-sketched mathematical expressions and structured flowcharts on notebook computers and interactive worksurfaces."
}