@book { CromlechsDolmenundMenhire,
    title = "Cromlechs, Dolmen und Menhire",
    author = "Udo {Worschech}",
    year = "2021",
    publisher = "Peter Lang Verlag",
    address = "Berlin, Germany",
    url = "https://www.peterlang.com/document/1093434"
}