HUDZENKO, V., N. LOZYTSKA, and S. DOBROVOLSKYI. 2006. “MONITORING OF STRONTIUM-90 GROUND SURFACE POLLUTION”. Visnyk of Taras Shevchenko National University of Kyiv. Geology, no. 38-39 (July): 65-68. https://geology.bulletin.knu.ua/article/view/3313.