Dudek, Jarosław. “Status of the Vlachs in Eleventh-Century Byzantium (according to ‘Book of Advice’ by Kekaumenos)”. Balcanica Posnaniensia. Acta et studia 25 (February 15, 2019): 197-218. Accessed September 23, 2021. https://pressto.amu.edu.pl/index.php/bp/article/view/12807.