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Romensky Olexandr Olexandrovych. Rus’ in the Foreign Policy of Byzantium in the Last Quarter of the 10th Century : к.і.н. : spec.. 07.00.02 - Всесвітня історія : presented. 2015-03-13; popup.evolution: .; Kharkov National University named after V.N. Karazin. – , 0415U000878.