@techreport{SchallaboeckPetersen1998,
  author    = {Schallab{\"o}ck, Karl Otto and Petersen, Rudolf},
  title     = {The spread of congestion in Europe},
  institution = {Wuppertal Institut f{\"u}r Klima, Umwelt, Energie},
  address   = {Wuppertal},
  pages     = {17},
  year      = {1998},
  language  = {en}
}