@book { DerdigitaleFilm,
    title = "Der digitale Film",
    author = "Christian {Gierke}",
    year = "2001",
    publisher = "Diplom.de",
    address = "Hamburg, Deutschland",
    doi = "10.3239/9783832442484",
    url = "https://m.diplom.de/document/219863"
}