@book { DerBildhauerRichardKauffungen18541942,
    title = "Der Bildhauer Richard Kauffungen (1854-1942)",
    author = "Olga {Stieglitz} and Gerhard {Zeillinger}",
    year = "2021",
    publisher = "Peter Lang Verlag",
    address = "Berlin, Germany",
    url = "https://www.peterlang.com/document/1104655"
}