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2. L. V. Bogdandy andJ. J. Engell, “The reduction of iron ores” (Springer Verlag, Berlin, 1971).
3. E. T. Turkdogan andJ. V. Vinters,Met. Trans. 2 (1971) 3175.
4. Idem, ibid. 3 (1972) 1561.
5. A. P. Prosser, Influence of mineralogical factors on the rates of chemical reaction of minerals, in “Mineral processing and extractive metallurgy” (IMM, London, 1970) p. 59. 9th Commonwealth Mineral Metallurgy Congress (1969) Vol. 3.