Byzantine and Rus' seals : proceedings of the International Colloquium on Rus'-Byzantine Sigillography, Kyiv, Ukraine, 13-16 September 2013 - Ivakin, G. U.; Khrapunov, Nikita,; Seibt, Werner, (The Sheremetievs' Family Museum of Historical and Cultural Rarities : The Ukrainian National Committee for Byzantine Studies, 2015)