@book { Radiolandschaften,
    title = "Radiolandschaften",
    subtitle = "Beiträge zur Geschichte und Entwicklung des Hörfunks",
    author = "Hans-Jürgen {Krug}",
    year = "2002",
    publisher = "Peter Lang Verlag",
    address = "Berlin, Germany",
    url = "https://www.peterlang.com/document/1094306"
}