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2. B. Bhushan, B.K. Gupta, Handbook of Tribology, McGraw-Hill, New York, 1991.
3. Comparative study of surface deposits and behaviour of MoS2 particles and molybdenum dialkyl-dithio-phosphate
4. A study of solid lubricants in oils and greases under boundary conditions
5. F.P. Bowden, D. Tabor, Friction: An Introduction to Tribology, Vol. 91, Anchor, Garden City, New York, 1973.