@book { BildTonSchriftSchutzvongeistigemMaterialinMultimedia,
    title = "Bild-Ton-Schrift: Schutz von geistigem Material in Multimedia",
    author = "Alexander {Wolf}",
    year = "1997",
    publisher = "Diplom.de",
    address = "Hamburg, Deutschland",
    doi = "10.3239/9783832404598",
    url = "https://m.diplom.de/document/216425"
}