1. A.W. Ashbrook, G.M. Ritcey, Hydrometallurgical processing of superalloy scrap for the recovery of cobalt and nickel. Paper presented at the Conference of Metallurgists, Montreal, Canada, August 30, 1971.
2. M.J. Price, J.G. Reid, Proceedings of International Solvent Extraction Conference, ISEC'93, York, UK, 1993, Vol. 1, pp. 159–166.
3. A State-of-the-Art Discussion on the Solvent Extraction Reagents Used for the Recovery of Copper from Dilute Sulfuric Acid Leach Solutions
4. Jiaoyong Yang, Proceedings of International Solvent Extraction Conference, ISEC'93, York, UK, 1993, Vol. 1, pp. 183–188.