LESZKA, Mirosław J. (ED.). Bulgarian-Byzantine Relations during the Reign of Symeon I the Great (893–927). In: (ed.). The Bulgarian State in 927-969. The Epoch of Tsar Peter I: No. XXXIV. Byzantina LodziensiaPoland: Lodz University Press,2018. p. 35–46. DOI: 10.18778/8142-115-7.04. Disponível em: https://press.uni.lodz.pl/index.php/wul/catalog/book/1057/chapter/2724. Acesso em: 15 feb. 2026.