@book { MarktundMachtimRundfunk,
    title = "Markt und Macht im Rundfunk",
    author = "Ralph {Wiechers}",
    year = "2018",
    publisher = "Peter Lang Verlag",
    address = "Berlin, Germany",
    doi = "10.3726/b13703",
    url = "https://www.peterlang.com/document/1068285"
}