@book { WertgrenzenvonDevisenoptionen,
    title = "Wertgrenzen von Devisenoptionen",
    author = "Sven {Husmann}",
    year = "1997",
    publisher = "Diplom.de",
    address = "Hamburg, Deutschland",
    doi = "10.3239/9783832402525",
    url = "https://m.diplom.de/document/216197"
}