Ochmann, A. A. Distribution of Radon Activity in the Atmosphere above Wzgórza Niemczansko-Strzelinskie (South-WestPoland) and Its Dependence on Uranium and Thorium Content in the Underlying Rock and Indirect Ground Basement. Ann. Geophys. 2005, 48 (1). https://doi.org/10.4401/ag-3186.