@book { InteractiveTVintheUK,
    title = "Interactive TV in the UK",
    subtitle = "New advertising opportunities in comparison",
    author = "Barbara {Katz}",
    year = "2001",
    publisher = "Diplom.de",
    address = "Hamburg, Deutschland",
    doi = "10.3239/9783832443528",
    url = "https://m.diplom.de/document/219964"
}