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2. E. Peretti: Discussions of the Faraday Society, no. 4, 1948, pp. 179–184.
3. E. D. Peters: Modern American Methods of Copper Smelting, Scientific Publishing Co., New York, 1887, p. 335.
4. H. O. Hofman, and C. R. Hayward: Metallurgy of Copper, McGraw-Hill, New York, 1924, p. 204.
5. T. Tsuramoto: Journal of Metals, Nov. 1961, pp. 820–824.