@book { KonzeptionvonKontrollrechnungen,
    title = "Konzeption von Kontrollrechnungen",
    author = "Marc {Knöll}",
    year = "1998",
    publisher = "Diplom.de",
    address = "Hamburg, Deutschland",
    doi = "10.3239/9783832406325",
    url = "https://m.diplom.de/document/216563"
}