Sardaryan, A.S., M.A. Grigoryan, V.P. Vardanyan, and M.S. Mkrtchyan. 2019. “FEATURES RADIATION FIELD IN NATURAL AND ARTIFICIAL UNDERGROUND CAVITIES: (according to Observations in Мozrov and Аrji Caves)”. Proceedings of the YSU C: Geological and Geographical Sciences 53 (3 (250). Yerevan, Armenia:161-65. https://doi.org/10.46991/PYSU:C/2019.53.3.161.