1. Shur, E.A., On optimal correlation of hardness rails and wheels, Proc. Sci.-Techn. Conf. “Contemporary Problems of Interaction of Rolling Stock and Line” Moscow: Allruss. Sci. Inst. Railway Transport, 2003, pp. 87–93.
2. Larin, T.V., On optimal hardness of friction pair “wheel–rail” elements, Vestn. Vse-Ross. Nauchn. Inst. Zhelezn. Transport, 1965, no. 3, pp. 5–9.
3. Gapanovich, V.A. and Sosnovskii, L.A., What should be hardness of rails? Zhelezn. Transport, 2009, no. 12, pp. 36–40.
4. Petrakova, A.G., Optimization of material hardness of solid-rolled wheel of freight car, J. Friction Wear, 2009, Vol. 30, pp. 41–45.
5. Bun’kova, T.G., Choice of optimal correlation for hardness of freight car solid-rolled wheel and railway rail, Dizain Tekhnol., 2012, no. 28, pp. 102–110.