@book { LowCostCarrier,
    title = "Low-Cost-Carrier",
    author = "Ayhan {Georgi, geb. Yilmaz}",
    year = "2007",
    publisher = "Diplom.de",
    address = "Hamburg, Deutschland",
    doi = "10.3239/9783836602303",
    url = "https://m.diplom.de/document/228810"
}