@book { Powerline,
    title = "Powerline",
    subtitle = "Verfassungs-, verwaltungs- und telekommunikationsrechtliche Probleme",
    author = "Frank {Reinhardt}",
    year = "2003",
    publisher = "Peter Lang Verlag",
    address = "Berlin, Germany",
    url = "https://www.peterlang.com/document/1096002"
}