@book { ZumVerhltnisvonPreisundQualitt,
    title = "Zum Verhältnis von Preis und Qualität",
    author = "Volker {Simmering}",
    year = "1999",
    publisher = "Diplom.de",
    address = "Hamburg, Deutschland",
    doi = "10.3239/9783832417543",
    url = "https://m.diplom.de/document/217620"
}