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4. N.A. Warner, “Conductive Heating and Melt Circulation in Pyrometallurgy,” Trans. Inst. Min. Metall. C, 112 (December 2003), pp. C141–C153.
5. S. Eketorp, O. Wijk, and S. Fukagawa, “Direct Use of Coal for Production of Molten Iron,” Extraction Metallurgy ′81 (London: Inst. Min. Metall., 1981), pp. 184–192.