@book { InternetalskonomischesSystem,
    title = "Internet als ökonomisches System",
    author = "Wolfgang {Gierscher}",
    year = "1998",
    publisher = "Diplom.de",
    address = "Hamburg, Deutschland",
    doi = "10.3239/9783832406691",
    url = "https://m.diplom.de/document/216599"
}