MARINOW, Kirił. Settlers, strongholds, themes. Byzantine activities to strengthen the border with Early Medieval Bulgaria, 7th–10th c. Balcanica Posnaniensia. Acta et studia, [S. l.], v. 26, p. 5–30, 2020. DOI: 10.14746/bp.2019.26.1. Disponível em: https://pressto.amu.edu.pl/index.php/bp/article/view/20525. Acesso em: 23 apr. 2024.