@book { QualitativePrognosemethodeninderUnternehmensfhrung,
    title = "Qualitative Prognosemethoden in der Unternehmensführung",
    author = "Florian {Pafel}",
    year = "2004",
    publisher = "Diplom.de",
    address = "Hamburg, Deutschland",
    doi = "10.3239/9783832481582",
    url = "https://m.diplom.de/document/223382"
}