MARINOW, Kirył. The Haemus Mountains as a shelter, an attack outpost and an observation post in the light of the Bulgarian-Byzantine military relations in the early Middle Ages. Balcanica Posnaniensia. Acta et studia, [S. l.], v. 20, p. 5–17, 2013. DOI: 10.14746/bp.2013.20.1. Disponível em: https://pressto.amu.edu.pl/index.php/bp/article/view/1725. Acesso em: 24 apr. 2024.