@book{KathmannZieglerThomas2011,
  author    = {Thorsten Kathmann and Hartmut Ziegler and Bernd Thomas},
  title     = {Stra{\"s}enverkehrsz{\"a}hlung 2005 - Methodik},
  isbn      = {978-3-86509-901-3},
  year      = {2011},
}