Modern Geodetic Measurement Techniques in Gravimetric Studies on the Example of Gypsum Karst in the Siesławice RegionSławomir Porzucek, Monika Łój, Karolina Matwij and Wojciech MatwijE3S Web Conf., 35 (2018) 03002DOI: https://doi.org/10.1051/e3sconf/20183503002