p.615, Wilmot "[the Red Army] entered Belgrade ... at the same time as Tito's partisans."; p.152, Seaton; "The Russians had no interest in the German occupation forces in Greece and appear to have had very little interest in those retiring northwards through Yugoslavia...Stalin was content to leave to Tito and the Bulgarians the clearing of Yugoslav territory from the enemy."; Library of Congress Country Studies citing "information from Documents on German Foreign Policy, 1919–1945, Arlington, Virginia, 1976": "...Soviet troops crossed the border on October 1, and a joint Partisan-Soviet force liberated Belgrade on October 20."
http://www.soldat.ru/spravka/freedom/12-yugoslavia.html Dudarenko, M.L., Perechnev, Yu.G., Yeliseev, V.T., et.el., Reference guide "Liberation of cities": reference for liberation of cities during the period of the Great Patriotic War 1941–1945, Moscow, 1985 (Дударенко, М.Л., Перечнев, Ю.Г., Елисеев, В.Т. и др., сост. Справочник «Освобождение городов: Справочник по освобождению городов в период Великой Отечественной войны 1941–1945»)
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Иво Антонов, началник на отдел „Военни паметници и военно-патриотично възпитание“ при МО. В-к „Труд“, 05.11.2016 г.