1. Kragel’skii, I.V., Dobychin, M.N., and Kombalov, V.S., Osnovy raschetov na trenie i iznos (Foundations of Calculation on Friction and Wear), Moscow: Mashinostroenie, 1976.
2. Maksak, V.V., Predvaritel’noe smeshchenie i kontaktnaya zhestkost’ (Preliminary Displacement and Contact Hardness), Moscow: Nauka, 1975.
3. Myshkin, N.K. and Petrokovets, M.I., Trenie, smazka, iznos (Friction, Lubricating, Wear), Moscow: Fizmatlit, 2007.
4. Blau, P., The significance and use of the friction coefficient, Tribol. Int., 2001, vol. 34, pp. 585–591.
5. Ivkovic, B., Durdjanovic, M., and Stamenkovic, D., The Influence of the contact surface roughness on the static friction coefficient, Tribol. Ind., 2000, vol. 22, nos. 3–4, pp. 41–44.