Француз АЙ, Корінний ММ. Theoretical and legal research of the position and role of the proto-Bulgarians in the ethnogenesis of the medieval Ukrainian nationality, establishing its statehood, law, language and culture (IV–XI centuries). lbku. 2018;(31):6-17. Accessed November 4, 2026. https://lbku.krok.edu.ua/index.php/krok-university-law-journal/article/view/83