@book{Call1993,
  author    = {Call, Guido},
  title     = {H{\"o}rfunkstudie 1993 - Die Programmakzeptanz des Belgischen Rundfunks in der Euregio},
  address   = {Aachen},
  year      = {1993},
  language  = {de}
}
@book{Call1997,
  author    = {Call, Guido},
  title     = {Entstehung und Markteinf{\"u}hrung von Produktneuheiten},
  publisher = {Gabler},
  address   = {Wiesbaden},
  isbn      = {3409136975},
  pages     = {XX, 290 S.: graph. Darst.},
  year      = {1997},
  language  = {de}
}
@book{Timme2001,
  author    = {Timme, Michael},
  title     = {Die juristische Bew{\"a}ltigung des {\"o}konomischen Netzwerkgutes : Epidemiepr{\"a}vention in Rechtsgeschichte und Gegenwart / Michael Timme},
  publisher = {Nomos-Verl.-Ges.},
  address   = {Baden-Baden},
  isbn      = {3-7890-7055-6},
  pages     = {187},
  year      = {2001},
  language  = {de}
}
@book{SchulteZurhausen2005,
  author    = {Schulte-Zurhausen, Manfred},
  title     = {Organisation. - 4., {\"u}berarb. und erw. Aufl.},
  publisher = {Vahlen},
  address   = {M{\"u}nchen},
  isbn      = {3-8006-3205-5},
  pages     = {XVI, 620 S. : graph. Darst.},
  year      = {2005},
  language  = {de}
}