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2. Grigorovich, K.V., Arsenkin, A.M., Trushnikova, A.S., et al., Nonmetallic Inclusions: Estimating and Predicting the Operational Life of Rail, Nemetallicheskie vklyucheniya v rel’sovoi stali (Nonmetallic Inclusions in Rail Steel), Yekaterinburg: UIM, 2005, pp. 102–115.