Француз, А. Й., and М. М. Корінний. “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)”. Legal bulletin of «KROK» University, no. 31 (June 29, 2018): 6–17. Accessed November 3, 2026. https://lbku.krok.edu.ua/index.php/krok-university-law-journal/article/view/83.