POLGÁR, S. The Russian Primary Chronicle on the nomadic peoples of the Eastern European steppe I. Scythians, Danubian Bulgars, Ughors, Avars, Khazars. Acta Historica (Szeged), [S. l.], v. 146, p. 15–31, 2021. Disponível em: https://iskolakultura.hu/index.php/acthist/article/view/45609. Acesso em: 17 jul. 2024.