Stoyanova, V., A. Ravnachka, and S. Genchev. “APPLYING CLUSTER ANALYSIS IN THE BULGARIAN CHEMICAL INDUSTRY FOR THE PERIOD 2010–2020”. Journal of the Geographical Institute “Jovan Cvijić” SASA, vol. 74, no. 2, Aug. 2024, pp. 165–180, doi:10.2298/IJGI240312011S .