Кириченко, Максим. “The Severians Ethnonym in the Writing Sources of the IX Century”. V. N. Karazin Kharkiv National University Bulletin History of Ukraine. Ukrainian Studies: Historical and Philosophical Sciences 270 (March 2, 2019): 6-12. Accessed May 31, 2026. https://periodicals.karazin.ua/uahistory/article/view/12340.