@book { OkkupantenundOkkupierte,
    title = "Okkupanten und Okkupierte",
    author = "Helmut {Stubbe da Luz}",
    year = "2023",
    publisher = "Peter Lang Verlag",
    address = "Berlin, Germany",
    url = "https://www.peterlang.com/document/1364272"
}