@techreport{GUM-2-0,
  author =	 {Bateman, John A. and Renate Henschel and Fabio
                  Rinaldi},
  year =	 1995,
  title =	 {{Generalized Upper Model} 2.0: documentation},
  institution =	 {GMD/Institut f{\"u}r Integrierte Publikations- und
                  Informationssysteme},
  address =	 {Darmstadt, Germany},
  URL =
                  {http://www.darmstadt.gmd.de/publish/komet/gen-um/newUM.html}
}