1. CYANEX 301® Binary Extractant Systems in Cobalt/Nickel Recovery from Acidic Sulphate Solutions;Bourget,2004
2. Metal complexes with organothiophosphorus ligands and extraction phenomena;Cote;Reviews in Inorganic Chemistry,1989
3. Solvent extraction in hydrometallurgy;Cox,1992
4. A hydrochloric acid process for nickeliferous laterites;Gibson,1997
5. Mihaylov, I.O., Krause, E., Laundry, S.W., Luong, C.V., 1995. Process for the extraction and separation of nickel and/or cobalt. US Patent 5,378,262.