T. A. . Bobrovskyy and A. A. . Evdokimova, “THE LEAD SEAL OF A BYZANTINE OFFICIAL OF THE LATE 11th — EARLY 12th CENTURIES FROM THE EXCAVATIONS 2019 IN THE YARD OF THE St. SOPHIA CATHEDRAL IN KYIV”, journal, vol. 38, no. 1(38), pp. 99–104, Jun. 2021.