1. D. J. Robinson and T. J. O’Keefe:J. Appl. Electrochem., 1976, vol. 6, no. 1, pp. 1–7.
2. J. H. Bain, D. C. Haigh, and L. C. Parsons:Trans. TMS-AIME, 1964, vol. 230, pp. 944–50. See alsoMining Mag., 1975, Dec, pp. 426-35.
3. E. Mariyama and Y. Yamamoto:AIME World Symposium On Mining and Metallurgy of Lead and Zinc, vol. 2, pp. 198–222, AIME, New York, 1970.
4. T. D. Michelis and F. Gnesooto:AIME World Symposium On Mining and Metallurgy of Lead and Zinc, vol. 2, pp. 269–307, AIME, New York, 1970.
5. D. J. DeBiasio and C. J. Krauss: Canadian Patent 978137, assigned to Cominco Ltd., November 18, 1975.