@book { RheinlandfrageundRheinlandbewegung19181933,
    title = "Rheinlandfrage und Rheinlandbewegung (1918-1933)",
    author = "Klaus {Reimer}",
    year = "2021",
    publisher = "Peter Lang Verlag",
    address = "Berlin, Germany",
    url = "https://www.peterlang.com/document/1072190"
}