@book { RechnungswesenversusAccounting,
    title = "Rechnungswesen versus Accounting",
    author = "Felix {Tannenberger}",
    year = "2001",
    publisher = "Diplom.de",
    address = "Hamburg, Deutschland",
    doi = "10.3239/9783832443054",
    url = "https://m.diplom.de/document/219909"
}