@book{AngenendtBlaseKloeckner2011,
  author    = {Wilhelm Angenendt and Arne Blase and Dorothee Kl{\"o}ckner},
  title     = {Verbesserung der Radverkehrsf{\"u}hrung an Knoten},
  isbn      = {3-86509-322-1},
  year      = {2011},
}