Pshinko, O.M., Krasniuk, O.V., Lysniak, V.P. and Gromova, O.V. 2007. ANALYSIS OF EXISTING METHODS OF PURIFICATION AND RECYCLING OF POLLUTING BALLAST GRAVEL. Science and Transport Progress . 17 (Aug. 2007), 209–213. DOI:https://doi.org/10.15802/stp2007/17634.