00650naa#a2200169#i#450# EN\\bibl\92840 20250525210425.7 2413-189X 20241227b2024####ek#y0engy0150####ca RU Defensive Structures atop of the Plateau of Eski-Kermen in the Context of Fortification Building on the Early Byzantine Frontier: Presentation of the Question Journal article Simferopol V.I. Vernadsky Crimean Federal University 2024 10 с. Journal article local География. Биография. История. 9 Denisenko N. D. cfuv.editorum.ru