DATSKIV, Ihor. Brest peace as the legal basis for the establishment of Ukrainian-Bulgarian diplomatic relations. Actual problems of law (Aktual’ni problemi pravoznavstva), [S. l.], v. 1, n. 2, p. 20–25, 2019. DOI: 10.35774/app2019.02.020. Disponível em: https://appj.wunu.edu.ua/index.php/apl/article/view/696. Acesso em: 8 apr. 2026.