@book { KreditrisikenPortfoliomodelleundSimulation,
    title = "Kreditrisiken - Portfoliomodelle und Simulation",
    author = "Johannes {Merkl}",
    year = "2010",
    publisher = "Diplom.de",
    address = "Hamburg, Deutschland",
    doi = "10.3239/9783836641364",
    url = "https://m.diplom.de/document/227538"
}