@book { DieverewigteStadt,
    title = "Die verewigte Stadt",
    author = "Ralf Georg {Czapla} and Anna {Fattori}",
    year = "2021",
    publisher = "Peter Lang Verlag",
    address = "Lausanne, Switzerland",
    url = "https://www.peterlang.com/document/1104370"
}