1. ASTM STP;P. M. Sargent,1986
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3. H. Buckle, in “Science of Hardness Testing and Its Research Applications”, edited by J. H. Westbrook and H. Conrad (American Society for Metals, Metals Park, Ohio, 1971) ch. 33, pp. 453–491.
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5. ASTM STP;D. Tabor,1986