@book { DasLuftverkehrsabkommenOpenSkies,
    title = "Das Luftverkehrsabkommen Open Skies",
    author = "Sylvia {Kinne}",
    year = "2009",
    publisher = "Diplom.de",
    address = "Hamburg, Deutschland",
    doi = "10.3239/9783836630764",
    url = "https://m.diplom.de/document/226858"
}