@article{Toennissen2011,
  author    = {T{\"o}nnissen, Stefan},
  title     = {Die planerische Behandlung von Leerkosten bei Unterbesch{\"a}ftigung},
  series = {Controller Magazin},
  volume    = {36/2011},
  journal   = {Controller Magazin},
  issn      = {0939-0359},
  pages     = {75 -- 79},
  year      = {2011},
  language  = {de}
}
@article{Toennissen2011,
  author    = {T{\"o}nnissen, Stefan},
  title     = {Ursachen und L{\"o}sungen von St{\"o}rungen im Kommunikationsprozess des Controllers},
  series = {Controller Magazin},
  volume    = {36/2011},
  journal   = {Controller Magazin},
  issn      = {0939-0359},
  pages     = {65 -- 68},
  year      = {2011},
  language  = {de}
}
@article{Toennissen2011,
  author    = {T{\"o}nnissen, Stefan},
  title     = {Existenzgr{\"u}ndung eines Unternehmens {\"u}ber den nebenberuflichen Einstieg},
  series = {Controller Magazin},
  volume    = {36/2011},
  journal   = {Controller Magazin},
  issn      = {0939-0359},
  pages     = {55 -- 58},
  year      = {2011},
  language  = {de}
}