@techreport{Klose-etal91,
  author	= {Klose, Gudrun and Lang, Ewald and Pirlein, Thomas},
  year		= {1991},
  title		= {Die Ontologie und Axiomatik der Wissensbasis von LEU/2: Erfahrungen -- Probleme -- Ausblicke},
  number	= {IWBS Report 171},
  institution	= {IBM Deutschland, Stuttgart}
}