@book { Collateralizeddebtobligations,
    title = "Collateralized debt obligations",
    author = "Markus {Lorenz}",
    year = "2008",
    publisher = "Diplom.de",
    address = "Hamburg, Deutschland",
    doi = "10.3239/9783836621069",
    url = "https://m.diplom.de/document/226280"
}