@book { GrownUpInternet,
    title = "Grown-Up Internet",
    author = "Laurenz {Lenkewitz}",
    year = "2004",
    publisher = "Diplom.de",
    address = "Hamburg, Deutschland",
    doi = "10.3239/9783832480981",
    url = "https://m.diplom.de/document/223323"
}