Popit, Andreja, and Janja Vaupotič. “The Influence of Geology on Elevated Radon Concentrations in Slovenian Schools and Kindergartens ”. Geologija 45, no. 2 (December 31, 2002): 499–504. Accessed October 27, 2026. https://www.geologija-revija.si/index.php/geologija/article/view/1673.