@book { MortgageBackedSecurities,
    title = "Mortgage-Backed Securities",
    subtitle = "Ein Refinanzierungsinstrument auch am deutschen Markt?",
    author = "Michael {Osswald}",
    year = "2001",
    publisher = "Diplom.de",
    address = "Hamburg, Deutschland",
    doi = "10.3239/9783832438258",
    url = "https://m.diplom.de/document/219502"
}