@article{HebelBillionJohaenning2011,
  author    = {Christoph Hebel and Bernd Billion and Katja Joh{\"a}nning},
  title     = {Evaluation von Planungswerkst{\"a}tten in der St{\"a}dteRegion},
  journal   = {Stadt Region Land. 2011 (2011), H. 88},
  pages     = {15 -- 20},
  year      = {2011},
}