www.britannica.com/event/World-War-I/The-collapse-of-Austria-Hungary
warfarehistorynetwork.com/article/a-soviet-red-army-victory-at-vienna/
www.flamesofwar.com/Default.aspx?tabid=53&art_id=6648
www.demokratiewebstatt.at/thema/thema-die-oeffnung-des-eisernen-vorhangs/oesterreichs-rolle-im-geteilten-europa