Foreign military contingents and troops on the Lower Danube in the period late 9th – mid 11th century. Research Announcements "Heritage BG", [S. l.], n. 5, p. 12–35, 2025. DOI: 10.58894/AR-HBg.2023.5.12-35. Disponível em: https://periodicals.uni-sofia.bg/index.php/AR-NBg/article/view/1322. Acesso em: 10 mar. 2026.