Ivanov, Ivelin. 2022. “Bulgarians, Cumans, Teutons, and Vlachs in the First Decades of the Thirteenth Century”. Studia Ceranea. Journal of the Waldemar Ceran Research Centre for the History and Culture of the Mediterranean Area and South-East Europe 12 (October):491-505. https://doi.org/10.18778/2084-140X.12.05.