SIWKO, A. A "Commonwealth of Interest" in the Rus’ian-Byzantine Treaty (ca. 944). Studia Ceranea, [S. l.], v. 11, p. 405–426, 2021. DOI: 10.18778/2084-140X.11.20. Disponível em: https://czasopisma.uni.lodz.pl/sceranea/article/view/13152. Acesso em: 27 apr. 2024.