@book { InteraktiveBreitbanddienste,
    title = "Interaktive Breitbanddienste",
    author = "Daniel {Kießling}",
    year = "2003",
    publisher = "Diplom.de",
    address = "Hamburg, Germany",
    doi = "10.3239/9783832466008",
    url = "https://m.diplom.de/document/221990"
}