@book { CommercialMortgageBackedSecurities,
    title = "Commercial Mortgage-Backed Securities",
    author = "Jan {Schimmel}",
    year = "2004",
    publisher = "Diplom.de",
    address = "Hamburg, Deutschland",
    doi = "10.3239/9783832479794",
    url = "https://m.diplom.de/document/223005"
}