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3. A.S. Venkatradi and H.B. Bell, ibid, 1970, vol. 208, p. 110.
4. “Methods of Chemical Analysis of Iron and Steel,” British Steel Corporation, 1974.
5. G.R. St. Pierre and J. Chipman, J. Trans. Amer. Inst. Min. (Metall.) Engrs., 1956, vol. 206, p. 1474.