@book { RegainManagementinderTelekommunikationsbranche,
    title = "Regain Management in der Telekommunikationsbranche",
    author = "Sven {Tuzovic}",
    year = "1999",
    publisher = "Diplom.de",
    address = "Hamburg, Deutschland",
    doi = "10.3239/9783832412746",
    url = "https://m.diplom.de/document/217187"
}