@book { UnikateinZeitenderMassenproduktion,
    title = "Unikate in Zeiten der Massenproduktion",
    author = "Steff {Bert}",
    year = "2011",
    publisher = "Diplom.de",
    address = "Hamburg, Deutschland",
    doi = "10.3239/9783842815513",
    url = "https://m.diplom.de/document/228529"
}