@book { LowCostAirlinesKernelementedesGeschftsmodells,
    title = "Low-Cost Airlines. Kernelemente des Geschäftsmodells",
    author = "Michael {Kuhn}",
    year = "2014",
    publisher = "GRIN Verlag",
    address = "München, Germany",
    url = "https://www.hausarbeiten.de/document/278688"
}