ROMENSKY, Aleksandr A. From Enemies to Allies: the Mystery of Prince Oleg’s Campaign against Constantinople. Studia Ceranea, Poland, v. 11, p. 697–719, 2021. DOI: 10.18778/2084-140X.11.37. Disponível em: https://www.czasopisma.uni.lodz.pl/sceranea/article/view/13138. Acesso em: 9 aug. 2026.