MAMZER, Henryk. Socio-economic aspects of the development of iron metallurgy in Danubian Bulgaria during the Early Middle Ages. Balcanica Posnaniensia. Acta et studia, [S. l.], v. 2, p. 181–198, 1985. DOI: 10.14746/bp.1985.2.14. Disponível em: https://pressto.amu.edu.pl/index.php/bp/article/view/54825. Acesso em: 4 oct. 2026.