1. R. T. Lowson,Chem. Rev. 5 (1982) 482.
2. D. F. A., Koch, ?Modern Aspects of Electrochemistry,? Vol. 10, (1975) p. 211.
3. E. Peters, ?Trends in Electrochemistry?, (edited by J. O'M. Bockris, D. A. J. Rand and B. J. Welch), Plenum, New York (1976) p. 267.
4. R. Woods, ?Principles of Mineral Flotation?, Wark Symp. Aust. I. M. M. (1983) p. 91.
5. D. K. Nordstrom, ?Acid Sulphate Weathering?, SSAS special publication no. I (1982) p. 37.