@article{BleckenHolthausSellheier2011,
  author    = {Blecken, Udo and Holthaus-Sellheier, Ursula},
  title     = {Quantitative Prognoseverfahren f{\"u}r den B{\"u}roimmobilienmarkt, Tl.1},
  series = {GuG : Grundst{\"u}cksmarkt und Grundst{\"u}ckswert},
  volume    = {21},
  journal   = {GuG : Grundst{\"u}cksmarkt und Grundst{\"u}ckswert},
  number    = {1},
  publisher = {Werner},
  address   = {K{\"o}ln},
  isbn      = {0938-0175},
  pages     = {30 -- 39},
  year      = {2011},
  language  = {de}
}
@article{Hebel2011,
  author    = {Hebel, Christoph},
  title     = {Anwendungen von makroskopischen Personenverkehrsnachfragemodellen},
  series = {Stadt Region Land. 2011 (2011), H. 88},
  journal   = {Stadt Region Land. 2011 (2011), H. 88},
  publisher = {ISB},
  address   = {Aachen},
  isbn      = {978-3-88354-162-4},
  pages     = {7 -- 14},
  year      = {2011},
  language  = {de}
}
@article{HebelBillionJohaenning2011,
  author    = {Hebel, Christoph and Billion, Bernd and Joh{\"a}nning, Katja},
  title     = {Evaluation von Planungswerkst{\"a}tten in der St{\"a}dteRegion},
  series = {Stadt Region Land. 2011 (2011), H. 88},
  journal   = {Stadt Region Land. 2011 (2011), H. 88},
  publisher = {RWTH},
  address   = {Aachen},
  isbn      = {978-3-88354-162-4},
  pages     = {15 -- 20},
  year      = {2011},
  language  = {de}
}