Dudek, J. Western Balkans (7th–14th c.) – Lost and Restored to Byzantium. In Phantom of Muhammad, Shade of Samuel Byzantine Empire in Relation to Members of Other Cultures and Religions (7th–15th c.): No. XXXIX; Brzozowska, Z. A., Leszka, M. J., Marinow, K., Wolińska, T., Eds.; , Series Ed.; Byzantina Lodziensia; Lodz University Press: Poland, 2020; pp. 45-58. https://doi.org/10.18778/8142-804-0.03.