TY JOUR TI Defensive Structures atop of the Plateau of Eski-Kermen in the Context of Fortification Building on the Early Byzantine Frontier: Presentation of the Question KW fortifications KW mediaeval city KW Eski-Kermen plateau KW Crimea KW Byzantine frontier KW urban history JO Materials in Archaeology, History and Ethnography of Tauria AU Denisenko, N.D. PY 2024 IS 0 PB V.I. Vernadsky Crimean Federal University