1. Bowden, F.P., and Tabor, D.: The Friction and Lubrication of Solids, Vol 1, London : Oxford University Press, 1950, p 72.
2. RABiNowicz, E.: Friction and Wear of Materials, New York: John Wiley, 1965, pp 102-106.
3. Engineering model for wear
4. Bowden, F.P., and Tabor, D.: Friction and Lubrication, London: Methuen Co. Ltd., 1967, pp 5-7.
5. FRICTION, WEAR, AND LUBRICATION