@book{Gauchel1999,
  author    = {Gauchel, Joachim},
  title     = {Flexible Montageautomatisierung},
  address   = {FH Aachen},
  year      = {1999},
  language  = {de}
}
@book{Gauchel1999,
  author    = {Gauchel, Joachim},
  title     = {Verbesserung der Qualit{\"a}t von Freiformoberfl{\"a}chen},
  address   = {FH Aachen},
  year      = {1999},
  language  = {de}
}
@book{KnepperPfeiffer1999,
  author    = {Knepper, Ludger and Pfeiffer, Johann},
  title     = {Diplom-Ingenieur / Diplom-Ingenieurin (Fachhochschule) Maschinenbau, Energie- und W{\"a}rmetechnik},
  publisher = {Bertelsmann},
  address   = {Bielefeld},
  pages     = {Loseblattausg.},
  year      = {1999},
  language  = {de}
}
@book{GrundmannSchoenholtz1999,
  author    = {Grundmann, Reinhard and Sch{\"o}nholtz, Friedrich},
  title     = {„Ventilatoren-Fibel" der Firma Babcock-BSH},
  publisher = {Promotor-Verlag},
  address   = {Karlsruhe},
  year      = {1999},
  language  = {de}
}