“A researcher of Old Russian antiquities of Chernigov is Semen Andronovich Gatsuk”, The Journal of V. N. Karazin Kharkiv National University. Series: History, no. 54, pp. 134–142, Aug. 2019, Accessed: Oct. 25, 2026. Available: https://periodicals.karazin.ua/history/article/view/13625