@book { WaltherSchoenborn18831956,
    title = "Walther Schoenborn (1883-1956)",
    author = "Claus-Nis {Martens}",
    year = "2021",
    publisher = "Peter Lang Verlag",
    address = "Berlin, Germany",
    url = "https://www.peterlang.com/document/1077984"
}