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3. W. M. Dressel, P. G. Barnard and M. M. Fine, US Bureau of Mines. Report of Investigation 7927 (1974).
4. E. G. Valdez and K. C. Dean, US Bureau of Mines. Report of Investigation 8000 (1975).
5. E. R. Krishnan and W. F. Kemner, in “Disposal, recycling and recovery of electric furnace exhaust dust”, edited by Iron and Steel Society, AIME (AIME, 1987) p. 77.