1. Adjemian, A. 1994. Papers Presented at the International Symposium ‘Hydrometallurgy 94’. Hydrometallurgy '94. July11–151994, Cambridge, England. pp.3–11. Chapman & Hall.
2. Anthony, M. T. and Flett, D. S. 1994. Papers Presented at the International Symposium ‘Hydrometallurgy '94’. Hydrometallurgy '94. July11–151994, Cambridge, England. pp.13–26. Chapman & Hall.
3. 2.13 Ion Exchange Processes in Hydrometallurgy
4. Lehto, J., Streat, M., Höll, W., Dale, J., Greig, J. and Yli-Pentti, A. 1998. Development of Advanced Ion Exchange Materials and Methods for the Removal of Toxic Metals from Metallurgical Waste Effluents. Proceedings of the TRAWMAR Workshop on Heavy Metals Removal from Liquid Effluents, Waste Incineration and Generic Technologies for Recycling. September 21–231998, Rhodes, Greece. Vol. 1, pp.59–70. EUR 18846
5. Lehto, J., Leinonen, H., Koivula, R., Outola, P., Yli-Pentti, A. and Karppinen, T. 1999. Removal of Heavy Metals from Metallurgical Process and Waste Waters with Selective Ion Exchangers. Proceedings of the Global Symposium on Recycling, Waste Treatment and Clean Technology REWAS'99. September 5–91999, San Sebastian, Spain. Vol. III, pp.2449–2458.