@book { DieKennzahlderCombinedRatioinderVersicherungswirtschaft,
    title = "Die Kennzahl der Combined Ratio in der Versicherungswirtschaft",
    author = "Günther {Egger}",
    year = "2005",
    publisher = "Diplom.de",
    address = "Hamburg, Deutschland",
    doi = "10.3239/9783832489014",
    url = "https://m.diplom.de/document/224076"
}