@book { ChancenundRisikenvonDigitalSignage,
    title = "Chancen und Risiken von Digital Signage",
    author = "Michael {Kaupp}",
    year = "2009",
    publisher = "Diplom.de",
    address = "Hamburg, Deutschland",
    doi = "10.3239/9783836639439",
    url = "https://m.diplom.de/document/227425"
}