CHROMČÁK, J.; GRINČ, M.; PÁNISOVÁ, J.; VAJDA, P.; KUBOVÁ, A. Validation of Sensitivity and Reliability of GPR and Microgravity Detection of Underground Cavities in Complex Urban Settings: Test Case of a Cellar. Contrib. Geophys. Geod. 2016, 46 (1), 13-32. https://doi.org/10.1515/congeo-2016-0002.