BORYSOVA, O. . WHO ARE THE ANCIENT BULGARIANS – ETHNOS OR MILITARY COMMUNITY?. EAST EUROPEAN HISTORICAL BULLETIN, [S. l.], n. 21, p. 18–30, 2021. DOI: 10.24919/2519-058X.21.246898. Disponível em: http://eehb.dspu.edu.ua/article/view/246898. Acesso em: 2 apr. 2025.