@book { DiedeutscheFrageindenTextenvonWalterUlbricht19451961,
    title = "Die deutsche Frage in den Texten von Walter Ulbricht 1945-1961",
    author = "Natalia {Holzer}",
    year = "2002",
    publisher = "Diplom.de",
    address = "Hamburg, Deutschland",
    url = "https://m.diplom.de/document/221356"
}