@InProceedings{Frank:1998:OOML,
  author =       "Ulrich Frank",
  title =        "Object-Oriented Modeling Languages: State of the Art and
                  Open Research Questions",
  pages =        "14--31",
  booktitle =    "The Unified Modeling Language -- Technical Aspects and
                  Applications",
  editor =       "Martin Schader and Axel Korthaus",
  publisher =    "Physica-Verlag, Heidelberg",
  year =         "1998",
}