@book { RudolfHerrnstadtundWilhelmZaisser,
    title = "Rudolf Herrnstadt und Wilhelm Zaisser",
    author = "Andrea {Görldt}",
    year = "2021",
    publisher = "Peter Lang Verlag",
    address = "Berlin, Germany",
    url = "https://www.peterlang.com/document/1094222"
}