BARDOLA, Kostiantyn. “The Unbroken Fellowship” What Did Khan Boris and Empress Theodora Agree upon?. Studia Ceranea, [S. l.], v. 14, p. 251–277, 2024. DOI: 10.18778/2084-140X.14.22. Disponível em: https://www.czasopisma.uni.lodz.pl/sceranea/article/view/25183. Acesso em: 17 dec. 2025.