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3. Maurer, Hammer, and Mobius: Arch. Eisenhüttenw. (1942) 16, p. 159.
4. White and Skelly: Journal Iron and Steel Inst. (1947) 155, p. 201.
5. Kitchener, Bockris, and Liberman: Discussions, Faraday Soc. (1948) No. 4, p. 49.