Study of the predominant defect development in rails of underground systems after preventive grinding and lubricationSerhii Voronin, Oleksii Skoryk, Volodymyr Stefanov, Dmytro Onopreychuk and Yevhen KorostelovMATEC Web Conf., 116 (2017) 03005DOI: https://doi.org/10.1051/matecconf/201711603005