@book { CostoderQualityleadershipundanderestrategischeAlternativenfreuropischeFluggesellschaften,
    title = "Cost- oder Qualityleadership und andere strategische Alternativen für europäische Fluggesellschaften",
    author = "Martin {Kößler}",
    year = "2003",
    publisher = "Diplom.de",
    address = "Hamburg, Deutschland",
    doi = "10.3239/9783832466213",
    url = "https://m.diplom.de/document/222010"
}