@article{KerkaKriegesmannSchwering2009,
  author    = {Kerka, Friedrich and Kriegesmann, Bernd and Schwering, Markus G.},
  title     = {Evaluating innovation ideas: a comprehensive approach to New Product Development},
  series = {INT. J. TECHNOLOGY INTELLIGENCE AND PLANNING, Vol. 5, No. 2},
  journal   = {INT. J. TECHNOLOGY INTELLIGENCE AND PLANNING, Vol. 5, No. 2},
  pages     = {118 -- 137},
  year      = {2009},
  language  = {mul}
}
@book{HufnagelHoldt2009,
  author    = {Hufnagel, W. and Holdt, W.},
  title     = {Einf{\"u}hrung in die Buchf{\"u}hrung und Bilanzierung. Buchungen im Handels- und Industriebetrieb, Grundlagen des handels- und steuerrechtlichen Jahresabschlusses, {\"U}berblick {\"u}ber die Jahresabschlussanalyse und IFRS},
  edition   = {4},
  publisher = {Herne},
  address   = {Berlin},
  isbn      = {978-3-482-538},
  year      = {2009},
  language  = {de}
}
@book{HufnagelKuehn2009,
  author    = {Hufnagel, W. and K{\"u}hn, R.},
  title     = {Betriebliches Rechnungswesen, Externes Rechnungswesen, LE 1-4},
  address   = {Hagen},
  year      = {2009},
  language  = {mul}
}