Kirilova, Krasimira. 2023. “OPTIMAL GEOPOTENTIAL MODELS OF THE EARTH’S GRAVITATIONAL FIELD FOR THE TERRITORY OF SOUTHWESTERN BULGARIA - RILA MOUNTAIN: OPTIMAL GEOPOTENTIAL MODELS OF THE EARTH’S GRAVITATIONAL FIELD FOR THE TERRITORY OF SOUTHWESTERN BULGARIA - RILA MOUNTAIN”. JOURNAL SCIENTIFIC AND APPLIED RESEARCH 19 (1):67-71. https://doi.org/10.46687/jsar.v19i1.295.