@book { RisikenderSteuerplanungfrEntrepreneure,
    title = "Risiken der Steuerplanung für Entrepreneure",
    author = "Torben {Fülscher}",
    year = "2009",
    publisher = "Diplom.de",
    address = "Hamburg, Deutschland",
    doi = "10.3239/9783836639125",
    url = "https://m.diplom.de/document/227413"
}