TYSZKIEWICZ, Lech Antoni. The Slavs and Turkic peoples before the appearance of the Proto-Bulgarians in the Balkans. Balcanica Posnaniensia. Acta et studia, [S. l.], v. 2, p. 5–18, 1985. DOI: 10.14746/bp.1985.2.1. Disponível em: https://pressto.amu.edu.pl/index.php/bp/article/view/54812. Acesso em: 4 oct. 2026.