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2. T. O. MULHEARN and D. TABOR,J. Inst. Met. 89 (1960) 7.
3. A. G. ATKINS, A. A. DOS SILVERIO and D. TABOR, ibid.94 (1966) 369.
4. W. W. WALKER and L. J. DEMER,Trans. AIME 230 (1964) 613.
5. W. W. WALKER, ?The Science of Hardness Testing and its Research Applications? (American Society for Metals, Metals Park, Ohio, 1973).