@unpublished{DeckerDanielErdmannetal.1999,
  author  = {Stefan Decker and Manfred Daniel and Michael Erdmann and Rudi Studer},
  title   = {An Enterprise Reference Scheme for Integrating Model Based Knowledge Engineering and Enterprise Modelling},
  institution = {Fachbereich Informatik},
  year    = {1999},
  url  = {http://nbn-resolving.de/urn:nbn:de:hbz:386-kluedo-1652},
}