@book { PopularisierungundIronieimWerkHeinrichHeines,
    title = "Popularisierung und Ironie im Werk Heinrich Heines",
    author = "Ursula {Lehmann}",
    year = "2021",
    publisher = "Peter Lang Verlag",
    address = "Berlin, Germany",
    url = "https://www.peterlang.com/document/1070054"
}