Vardanyan, V.P., and A.S. Sardaryan. 2015. “IMPACT OF NATURAL AND ANTHROPOGENIC RADIOACTIVE SOURCES ON POLLUTION OF THE ENVIRONMENT”. Proceedings of the YSU C: Geological and Geographical Sciences 49 (1 (236). Yerevan, Armenia:31-35. https://doi.org/10.46991/PYSU:C/2015.49.1.031.