@book{HesselerG{\"o}rtz2009,
  author    = {Hesseler, Martin and G{\"o}rtz, Marcus},
  title     = {ERP-Systeme im Einsatz},
  publisher = {W3L-Verlag},
  address   = {Herdecke},
  isbn      = {978-3-86834-006-8},
  pages     = {VII, 287},
  year      = {2009},
  language  = {de}
}
@book{Engels2009,
  author    = {Engels, Christoph},
  title     = {Basiswissen Business Intelligence},
  publisher = {W3L-Verlag},
  address   = {Herdecke},
  isbn      = {978-3-937137-37-7},
  pages     = {VIII, 200},
  year      = {2009},
  language  = {de}
}
@incollection{M{\"u}llerLategahnR{\"o}hrig2009,
  author    = {M{\"u}ller, Marcel and Lategahn, Julian and R{\"o}hrig, Christof},
  title     = {Automatic anchor calibration in IEEE 802.15.4a networks},
  series = {Proceedings : 6th workshop on positioning, navigation and communication 2009 (WPNC '09) ; Leibniz Universit{\"a}t Hannover, Germany, March 19, 2009},
  publisher = {IEEE},
  address   = {Piscataway, NJ},
  year      = {2009},
  language  = {en}
}
@incollection{R{\"o}hrig2009,
  author    = {R{\"o}hrig, Christof},
  title     = {Lokalisierungsverfahren f{\"u}r drathlose Sensornetzwerke},
  series = {Wireless communication and information : radio engineering and multimedia applications},
  publisher = {H{\"u}lsbusch},
  address   = {Boizenburg},
  pages     = {18},
  year      = {2009},
  language  = {de}
}
@article{Hesseler2009,
  author    = {Hesseler, Martin},
  title     = {Customizing von ERP-Systemen},
  series = {Controlling \& Management : ZfCM ; Zeitschrift f{\"u}r Controlling \& Management},
  number    = {3},
  issn      = {0931-9077},
  pages     = {8},
  year      = {2009},
  language  = {de}
}