@book { TheModellingofRiskofPortfolioswithCopulae,
    title = "The Modelling of Risk of Portfolios with Copulae",
    author = "Daniel {Kaufmann}",
    year = "2014",
    publisher = "Diplom.de",
    address = "Hamburg, Deutschland",
    url = "https://m.diplom.de/document/270415"
}