1. Boehringer Mannheim GMBH User’s Manual, 1989, Methods of Biochemical Analysis and Food Analysis using Test-Combinations, Revised edition, pp. 142.
2. Bosecker, K., 1985, “Leaching of lateritic nickel ores with heterotrophic microorganisms,” Proceedings of the 6th international symposium on Biohydrometallurgy, Vancouver, Canada, August 21–24.
3. Clark, D.S., et al., 1965, “Effect of potassium ferrocyanide on the chemical composition of molasses mash used in the citric acid fermentation,” Biotechnology and Bioengineering, vol. VII, pp. 269–278.
4. Crueger, W. and Crueger, A., 1990, Biotechnology: A textbook of industrial microbiology, Sinauer Associates, Inc., Sunderland, USA, second edition, pp. 343.
5. Dave, S.R., Natarajan, K.R., and Bhat, J.V., 1981, “Leaching of Copper and Zinc from oxidized ores by fungi,” Hydrometallurgy, Vol. 7, pp. 235–242.