“The Formation of the Administrative-Territorial System in the Context of the Formation of Modern Ethnogeographical Systems in Bulgaria”, JDSR, vol. 14, no. 2, pp. 15–23, Nov. 2024, Accessed: Apr. 20, 2026. [Online]. Available: https://dj.univ-danubius.ro/index.php/JDSR/article/view/3005