STANEV, K. The fortification system of Medieval Philippopolis. Contributions to Bulgarian Archaeology | Приноси към българската археология, [S. l.], v. 12, p. 147–182, 2022. DOI: 10.53250/cba12.147-182. Disponível em: https://publications.naim.bg/index.php/CBA/article/view/285. Acesso em: 14 jun. 2026.