STEPANOV, Tsvetelin. The History and Culture of Bulgaria in the 7th–12th Centuries: Between Two Easts and Two Wests. In: BRZOZOWSKA, Zofia A.; LESZKA, Mirosław J.; MARINOW, Kirił; WOLIŃSKA, Teresa (eds.). Phantom of Muhammad, Shade of Samuel Byzantine Empire in Relation to Members of Other Cultures and Religions (7th–15th c.): No. XXXIX. Byzantina LodziensiaPoland: Lodz University Press,2020. p. 163–176. DOI: 10.18778/8142-804-0.08. Disponível em: https://press.uni.lodz.pl/index.php/wul/catalog/book/177/chapter/331. Acesso em: 14 feb. 2026.