Petrov, K. ., and N. . Tsonkov. “Trends in the Regional Development of Medium-Sized Municipalities With a Population Between 10 and 50 Thousand in Eastern Bulgaria”. Edelweiss Applied Science and Technology, vol. 9, no. 1, Jan. 2025, pp. 879-95, doi:10.55214/25768484.v9i1.4268.