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2. R. M. Matveevskii, V. L. Lashkhi, I. A. Buyanovskii, et al., Lubricants. Antifriction and Antiwear Properties. Test Methods. A Handbook. [in Russian], Mashinostroenie, Moscow (1989).
3. J. M. Thorp, Wear, No. 23, 63?70 (1973).