Tomberger, Christoph, Peter Dietmaier, Walter Sextro, and Klaus Six. “Friction in Wheel--Rail Contact: A Model Comprising Interfacial Fluids, Surface Roughness and Temperature.”https://doi.org/10.1016/j.wear.2010.10.025__Wear 271 (2011): 2–12.https://doi.org/10.1016/j.wear.2010.10.025 .