@book{ZiegenbeinWalter2011,
  author    = {Ziegenbein, R. and Walter, J.},
  title     = {Transatlantische Internationalisierung von kleinen und mittleren Unternehmen - Implikationen und Konzeptans{\"a}tze},
  address   = {Dortmund/M{\"u}nster},
  year      = {2011},
  language  = {de}
}
@book{BrickauBehlingZiegenbein2005,
  author    = {Brickau, R. and Behling, S. and Ziegenbein, R.},
  title     = {Die Apotheke der Zukunft},
  volume    = {1},
  address   = {M{\"u}nster},
  isbn      = {978-3865822130},
  pages     = {111},
  year      = {2005},
  language  = {de}
}