ANDRÁSSY, Erik, Andrej MOJZEŠ, Ema NOGOVÁ, and Ondrej ČANGEL. 2021. “Surface Identification of Undermined Spaces With the Use of Soil Radon Emanometry”. Contributions to Geophysics and Geodesy 51 (2), 189-205. https://doi.org/10.31577/congeo.2021.51.2.5.