@book { AspektederRatingfunktioninderFinanzmarktkrise,
    title = "Aspekte der Ratingfunktion in der Finanzmarktkrise",
    author = "Viktor {Schulz}",
    year = "2009",
    publisher = "Diplom.de",
    address = "Hamburg, Deutschland",
    doi = "10.3239/9783836631556",
    url = "https://m.diplom.de/document/226916"
}