@book { DigitaleBildbearbeitung,
    title = "Digitale Bildbearbeitung",
    author = "Sandra {Sellink}",
    year = "2009",
    publisher = "Diplom.de",
    address = "Hamburg, Deutschland",
    doi = "10.3239/9783836634458",
    url = "https://m.diplom.de/document/227148"
}