Utkin, V. I., and A. K. Yurkov. “The Behavior of Radon in the Preparation of Geodynamic Processes”. Geofizicheskiy Zhurnal 32, no. 1 (February 1, 2010): 122–133. Accessed August 8, 2022. http://journals.uran.ua/geofizicheskiy/article/view/117574.