1. 1)Tainton, U.C., Tayler, A.G. and Ehrlinger, H.P. : Trans. AIMA, Vol. 85, p. 192, (1929)
2. 2)A. A. Adbul Azim : Corr. Sci., 12, p. 371, (1972)
3. 4)Kelly, D., Niessen, P. and Valeriote, E. M. L. : J. Electrochem. Soc., Vol. 132, p. 2533, (1985)
4. 7)Buttinelli, D., Giavarini, C. and Lupi, C. : Proc. Int. Symp. Extractive Metall. Zinc, p. 313, (1985)
5. 8)MacKinnon, D. J. and Brannen, J. M. : Mining Engineering, p. 409, (1982)