@book { Gesellschafterfremdfinanzierung,
    title = "Gesellschafterfremdfinanzierung",
    author = "Daniel {Riehle}",
    year = "2004",
    publisher = "Diplom.de",
    address = "Hamburg, Deutschland",
    doi = "10.3239/9783832478735",
    url = "https://m.diplom.de/document/223126"
}