1. Atmospheric acid leaching of nickel laterites review;McDonald;Part I. Sulphuric acid technologies, Hydrometallurgy,2008
2. Atmospheric acid leaching of nickel laterites review;McDonald;Part II. Chloride and Bio-Technologies, Hydrometallurgy,2008
3. The principles and applications of ammonia leaching of metals;Meng;Mineral Processing and Extractive Metallurgy Review,1996
4. D. Kerfoot D. Weir “The hydro and electrometallurgy of nickel and cobalt”, G. Tyroler, C. Landolt (Eds.), Extractive Metallurgy of Nickel and Cobalt (Proceedings of Intl. Symposium), TMS, Warrendale, Pa (1988), pp. 241-267
5. A. Monhemius “Treatment of laterite ores of nickel to produce ferronickel, matte or precipitated sulphide”, Extractive Metallurgy of Nickel, A. R. Burkin (Editor), Soc. Chem. Ind., London, 1987, pp 51-75