Kanev, Nikolay. “Two Byzantine Seals from the Excavation of the Medieval Fortress ‘Malkoto kale’ (Yambol Region, Bulgaria)”. Studia Ceranea 12 (October 12, 2022): 507–522. Accessed April 29, 2024. https://www.czasopisma.uni.lodz.pl/sceranea/article/view/14557.