@book{Laack1999,
  author    = {Laack, Walter van},
  title     = {Der Schl{\"u}ssel zur Ewigkeit},
  publisher = {van Laack},
  address   = {Aachen},
  isbn      = {978-3-9805239-4-3},
  pages     = {285 S.},
  year      = {1999},
  language  = {de}
}
@book{PfeifferKnepper1999,
  author    = {Pfeiffer, Johann and Knepper, Ludger},
  title     = {Diplom-Ingenieur/Diplom-Ingenieurin (Fachhochschule) Maschinenbau Energie- und W{\"a}rmetechnik},
  publisher = {Bertelsmann},
  address   = {Bielefeld},
  pages     = {Losebl.-Ausg.},
  year      = {1999},
  language  = {de}
}
@book{Pfeiffer1999,
  author    = {Pfeiffer, Johann},
  title     = {Verbesserung der Qualit{\"a}t von Freiformoberfl{\"a}chen},
  publisher = {Fachhochsch.},
  address   = {Aachen},
  year      = {1999},
  language  = {de}
}
@book{Meliss1999,
  author    = {Meliß, Michael},
  title     = {REGLOB 99 : Globale Betrachtung regenerativer Energieressourcen und ihrer technischen Nutzungsm{\"o}glichkeiten},
  publisher = {Solar-Institut},
  address   = {J{\"u}lich},
  year      = {1999},
  language  = {de}
}
@book{Wahle1999,
  author    = {Wahle, Michael},
  title     = {Angewandte Strukturanalyse. - (Dynamik)},
  publisher = {Mainz},
  address   = {Aachen},
  isbn      = {3-89653-567-6},
  pages     = {120, A41 S. : Ill., graph. Darst.},
  year      = {1999},
  language  = {de}
}
@book{SchmidtMuellerStoecker1999,
  author    = {Schmidt, Ludwig and M{\"u}ller, Thomas and St{\"o}cker, Ernst E.},
  title     = {Die Organschaft im K{\"o}rperschaftsteuer-, Gewerbesteuer- und Umsatzsteuerrecht},
  edition   = {5. Aufl.},
  publisher = {Verl. Neue Wirtschafts-Briefe},
  address   = {Herne},
  isbn      = {3-482-44605-9},
  pages     = {423 S.},
  year      = {1999},
  language  = {de}
}
@book{Wollert1999,
  author    = {Wollert, J{\"o}rg},
  title     = {Erfolgreich automatisieren unter Microsoft Windows : Technologie, Chancen, Grenzen und L{\"o}sungen f{\"u}r Automatisierungsaufgaben unter Windows},
  publisher = {Franzis},
  address   = {Poing},
  isbn      = {3772354440},
  pages     = {346 S.},
  year      = {1999},
  language  = {de}
}