@book { EinsatzderivativerFinanzinstrumenteinderPortfoliooptimierung,
    title = "Einsatz derivativer Finanzinstrumente in der Portfoliooptimierung",
    author = "Stefan {Biester}",
    year = "2004",
    publisher = "Diplom.de",
    address = "Hamburg, Deutschland",
    doi = "10.3239/9783832480615",
    url = "https://m.diplom.de/document/223292"
}