@book { AudioonDemandimWorldWideWeb,
    title = "Audio on Demand im World Wide Web",
    author = "Jörg {Enkel}",
    year = "1998",
    publisher = "Diplom.de",
    address = "Hamburg, Deutschland",
    doi = "10.3239/9783832411664",
    url = "https://m.diplom.de/document/217089"
}