Testing procedures of the Under Sleeper Pads applied in the ballasted rail track systemsCezary Kraśkiewicz, Wojciech Oleksiewicz, Monika Płudowska-Zagrajek and Andrzej PiotrowskiMATEC Web Conf., 196 (2018) 02046DOI: https://doi.org/10.1051/matecconf/201819602046