@book { BusinessReengineeringbeiAirlines,
    title = "Business Reengineering bei Airlines",
    subtitle = "Theoretische Fundierung, praktische Umsetzung und kritische Bewertung",
    author = "Michael {Hahnel}",
    year = "1999",
    publisher = "Diplom.de",
    address = "Hamburg, Deutschland",
    doi = "10.3239/9783832420048",
    url = "https://m.diplom.de/document/217845"
}