@techreport{Nebel-etal91,
  author	= {Nebel, Bernhard and Peltason, Christof and von Luck, Kai},
  month		= may,
  year		= {1991},
  title		= {Proceedings of International Workshop on Terminological Logics},
  number	= {DFKI-D-91-13},
  address	= {Saarbr{\"u}cken},
  institution	= {DFKI}
}