@book{BenknerDavid1999,
  author    = {Benkner, Thorsten and David, Klaus},
  title     = {Digitale Mobilfunksysteme : Grundlagen und aktuelle Systeme. - 2., aktualis. u. erw. Aufl.},
  publisher = {Teubner},
  address   = {Stuttgart},
  isbn      = {3-519-16181-8},
  pages     = {XIII, 457 S.. : graph. Darst.},
  year      = {1999},
  language  = {en}
}
@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}
}
@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{Schuermann1999,
  author    = {Sch{\"u}rmann, Wilhelm},
  title     = {Wohin kein Auge reicht : von der Entdeckung des Unsichtbaren / Konzeption: Wilhelm Sch{\"u}rmann},
  address   = {Hamburg},
  pages     = {185 S. : zahlr. Ill.},
  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{Hegewald1999,
  author    = {Hegewald, Ulf},
  title     = {Ziegelfeld am Keramion, Frechen ; 16.5.1999 - 30.9.2000, Keramion, Museum f{\"u}r zeitgen{\"o}ssische keramische Kunst},
  address   = {Frechen},
  pages     = {95 S. : zahlr. Ill., graph. Darst.},
  year      = {1999},
  language  = {de}
}
@book{FredebeulKrein1999,
  author    = {Fredebeul-Krein, Markus},
  title     = {Die Internationalisierung der M{\"a}rkte f{\"u}r Telekommunikationsdienste. IZ-Erhebung 1999},
  publisher = {Institut f{\"u}r Wirtschaftspolitik an der Universit{\"a}t K{\"o}ln},
  address   = {K{\"o}ln},
  year      = {1999},
  language  = {de}
}
@book{Janz1999,
  author    = {Janz, Norbert},
  title     = {Innovationsaktivit{\"a}ten in der deutschen Wirtschaft : Analyse der Mannheimer Innovationspanels im Verarbeitenden Gewerbe und im Dienstleistungssektor / Norbert Janz ... (Hrsg.)},
  publisher = {Nomos-Verl.-Ges.},
  address   = {Baden-Baden},
  isbn      = {3-7890-6179-4},
  pages     = {223 S. : zahlr. graph. Darst.},
  year      = {1999},
  language  = {de}
}
@book{JanzEblingGottschalketal.1999,
  author    = {Janz, Norbert and Ebling, G{\"u}nther and Gottschalk, Sandra and Niggemann, Hiltrud},
  title     = {2nd Community Innovation Survey. Final Report. Report prepared for Eurostat / Ebling, G. , S. Gottschalk, N. Janz und H. Niggemann},
  publisher = {ZEW Zentrum f{\"u}r Europ{\"a}ische Wirtschaftsforschung},
  address   = {Mannheim},
  year      = {1999},
  language  = {en}
}