1. Ball, R.O. (1987). Economic feasibility of a state-wide hydro-metallurgical recovery facility. In: Patterson, J.W. and Passino, R. (eds) Metals speciation, separation and recovery. pp. 690–709. Lewis Publ. Chelsea/Michigan.
2. Batley, G.E. (1989). Trace element speciation: analytical methods and problems, p 350, CRC Press, Florida.
3. Brierley, C.L. and Murr, L.E. (1973). Leaching: use of a thermophilic and chemoautotrophic microbe. Science, Vol 179, pp488–490.
4. Brierley, C.L. and Brierley, J.A. (1982). Anaerobic reduction of molybdenum by Sulfolobus, species. Zentralb. Bakt. Hyg. 1 Abt. Orig. C3, pp 289–294.
5. Callender, E. and Bowser, C.J. (1976). Freshwater ferromanganese deposits. in: Wolf, K.H. (ed.) Handbook of stratabound and stratiform ore deposits. Vol. 7, Elsevier, New York.