@book { DieKunstfreiheitalsEUGrundrecht,
    title = "Die Kunstfreiheit als EU-Grundrecht",
    author = "Ursula {Hoppe}",
    year = "2021",
    publisher = "Peter Lang Verlag",
    address = "Berlin, Germany",
    url = "https://www.peterlang.com/document/1107851"
}