“INVESTIGATION OF CHANGES IN INDOOR RADON CONCENTRATIONS BEFORE AND AFTER SEISMIC ACTIVITIES IN GYEONGJU AND POHANG, KOREA”. International Journal of Geomate 16, no. 56 (April 30, 2019): 98–103. Accessed October 19, 2026. https://geomatejournal.com/geomate/article/view/2679.