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2. R. Gohar, Elastohydrodynamics, J. Wiley and Sons, New York, (1988).
3. A. Bondi, Physical Chemistry of Lubricating Oils, Rheinhold, New York, (1951), p. 146.
4. A.W. Adamson, Physical Chemistry of Surfaces, 4th ed., John Wiley and Sons, New York, (1982) p. 402.
5. D.F. Moore, Principles and Applications of Tribology, Pergamon, New York, (1975).