Stepanov T. The History and Culture of Bulgaria in the 7th–12th Centuries: Between Two Easts and Two Wests. In: Brzozowska ZA, Leszka MJ, Marinow K, Wolińska T, editors. Phantom of Muhammad, Shade of Samuel Byzantine Empire in Relation to Members of Other Cultures and Religions (7th–15th c.): No. XXXIX [Internet]. Poland: Lodz University Press; 2020 [cited 2026 Jan. 24]. pp. 163-76. (, editor. Byzantina Lodziensia). Available from: https://www.press.uni.lodz.pl/index.php/wul/catalog/book/177/chapter/331