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3. H. Buckle,Met. Rev. 4 (1959) 49.
4. L. E. Samuels, ASTM STP 889 (American Society for Testing and Materials, Philadelphia, 1985) p. 5.
5. P. M. Sargent, ASTM STP 889 (American Society for Testing and Materials, Philadelphia, 1985) p. 160.