GRIGOROV, V. Ostrovski rampart. Problems of research and chronology. Contributions to Bulgarian Archaeology | Приноси към българската археология, [S. l.], v. 10, p. 67–95, 2020. Disponível em: https://publications.naim.bg/index.php/CBA/article/view/257. Acesso em: 6 oct. 2026.