@book { RisikenundChancenvonBitcoins,
    title = "Risiken und Chancen von Bitcoins",
    author = "Katharina {Litzenburger}",
    year = "2019",
    publisher = "GRIN Verlag",
    address = "München, Germany",
    url = "https://www.hausarbeiten.de/document/470083"
}