Ясновська, Людмила Василівна. “A Researcher of Old Russian Antiquities of Chernigov Is Semen Andronovich Gatsuk”. The Journal of V. N. Karazin Kharkiv National University. Series History0, no. 54 (August 5, 2019): 134-142. Accessed December 6, 2025. https://periodicals.karazin.ua/history/article/view/13625.