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Dimnik, Martin. The Dynasty of Chernigov, 1054–1146, pages 26-27, 36, 37, 38, 40...
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Dimnik, Martin. The Dynasty of Chernigov, 1054–1146, pages 26-27, 36, 37, 38, 40, 115. Pontifical Institute of Mediaeval Studies, Toronto, Ontano, Canada 1994.