@book { FlughafenalsProfitcenter,
    title = "Flughafen als Profitcenter",
    author = "Wadim {Tkatschew}",
    year = "2010",
    publisher = "Diplom.de",
    address = "Hamburg, Deutschland",
    doi = "10.3239/9783842804500",
    url = "https://m.diplom.de/document/228043"
}