@book { EntrybarriersintotheEuropeanCivilAviationmarkets,
    title = "Entry barriers into the European Civil Aviation markets",
    subtitle = "Theory and new evidence",
    author = "Mirko {Schnell}",
    year = "1999",
    publisher = "Diplom.de",
    address = "Hamburg, Deutschland",
    doi = "10.3239/9783832412692",
    url = "https://m.diplom.de/document/217182"
}