@book{BehrendtErnstHartkopfetal.2019,
  author    = {J{\"u}rgen Behrendt and Rudolf Ernst and Gerd Hartkopf and R{\"u}diger Hotop and Wilhelm Kockelke and Sigrid Metz-D{\"o}rner and Ingo Pfafferott},
  title     = {Erfahrungsbericht {\"u}ber Zonen-Geschwindigkeitsbeschr{\"a}nkungen},
  isbn      = {3-88314-891-1},
  year      = {2019},
}