Outdoor Radon as a Tool to Estimate Radon Priority Areas—A Literature Overview, Čeliković, I., Pantelić G., Vukanac I., Nikolić J.K., Živanović M., Cinelli Giorgia, Gruber V., Baumann S., Poncela L.S.Q., and Rabago D. , International Journal of Environmental Research and Public Health, Volume 19, Number 2, (2022)