@book { DasStadtbuchvonKarpfenKrupina,
    title = "Das Stadtbuch von Karpfen (Krupina)",
    author = "Karl-Heinz {Grothausmann}",
    year = "2021",
    publisher = "Peter Lang Verlag",
    address = "Berlin, Germany",
    url = "https://www.peterlang.com/document/1070256"
}