@techreport{HoepnerSiers2014,
  author    = {Hoepner, Gert and Siers, Carsten},
  title     = {6. Studie Vertriebskompass / durchgef{\"u}hrt von der FH Aachen und der Siers \& Collegen GmbH},
  publisher = {FH Aachen},
  address   = {Aachen},
  organization    = {FH Aachen},
  pages     = {35 Bl.},
  year      = {2014},
  language  = {de}
}
@techreport{HoepnerSiers2015,
  author    = {Hoepner, Gert and Siers, Carsten},
  title     = {7. Studie Vertriebskompass 2015/2016 / durchgef{\"u}hrt von der FH Aachen und der Siers \& Collegen GmbH},
  publisher = {FH Aachen},
  address   = {Aachen},
  pages     = {42 Bl.},
  year      = {2015},
  language  = {de}
}