@book { PaperlessOffice,
    title = "Paperless-Office",
    author = "Sven {Kunzmann}",
    year = "2010",
    publisher = "Diplom.de",
    address = "Hamburg, Deutschland",
    doi = "10.3239/9783836643979",
    url = "https://m.diplom.de/document/227669"
}