@techreport{SchallaboeckKoehn1997,
  author    = {Schallab{\"o}ck, Karl Otto and K{\"o}hn, Ady},
  title     = {Perspektiven des Luftverkehrs in Nordrhein-Westfalen : Studie im Auftrag des BUND NRW},
  institution = {Wuppertal Institut f{\"u}r Klima, Umwelt, Energie},
  address   = {Wuppertal},
  pages     = {182},
  year      = {1997},
  language  = {de}
}