@book{Westerheide1987,
  author    = {Westerheide, Peter},
  title     = {Ranglistenberechnung per Computer},
  address   = {Hamburg},
  year      = {1987},
  language  = {mul}
}
@book{BaakenLaunen1993,
  author    = {Baaken, Thomas and Launen, Michael},
  title     = {Software-Marketing},
  address   = {M{\"u}nchen},
  year      = {1993},
  language  = {mul}
}
@book{Balz1994,
  author    = {Balz, Ulrich},
  title     = {Betriebliche Altersversorgung},
  volume    = {1607},
  edition   = {1. Aufl.},
  publisher = {Lang},
  address   = {Frankfurt am Main [u.a.]},
  pages     = {XXXV, 220 S.},
  year      = {1994},
  language  = {mul}
}
@book{Dellmann1997,
  author    = {Dellmann, F},
  title     = {Verarbeitung partieller Wahrscheinlichkeitsinformationen in Entscheidungsunterst{\"u}tzenden Systemen Bd. 80},
  publisher = {Josef Eul Verlag},
  address   = {Lohmar},
  year      = {1997},
  language  = {mul}
}
@book{Pooten1999,
  author    = {Pooten, Holger},
  title     = {Grunds{\"a}tze ordnungsm{\"a}ßiger Unternehmensbewertung},
  publisher = {Fachbibliothek Verlag},
  address   = {B{\"u}ren},
  year      = {1999},
  language  = {mul}
}
@book{ThalenhorstLojewski2001,
  author    = {Thalenhorst, Jobst and Lojewski, U. von},
  title     = {Kostenrechnung},
  address   = {Stuttgart-Berlin-K{\"o}ln},
  year      = {2001},
  language  = {mul}
}
@book{Schengber2004,
  author    = {Schengber, Ralf},
  title     = {Handynutzungsverhalten in Deutschland - Eine Studie},
  address   = {M{\"u}nster},
  year      = {2004},
  language  = {mul}
}
@book{Schengber2005,
  author    = {Schengber, Ralf},
  title     = {Mobile Marketing - Wir sind noch ganz am Anfang},
  year      = {2005},
  language  = {mul}
}
@book{Multhaup2005,
  author    = {Multhaup, Roland},
  title     = {Marketingaktivit{\"a}ten deutscher Krankenh{\"a}user},
  year      = {2005},
  language  = {mul}
}
@book{LittkemannHoltupSchulte2006,
  author    = {Littkemann, J. and Holtup, M. and Schulte, K.},
  title     = {Buchf{\"u}hrung: Grundlagen - {\"U}bungen - Klausurvorbereitung},
  publisher = {Gabler},
  address   = {Wiesbaden},
  isbn      = {3409127070},
  year      = {2006},
  language  = {mul}
}