1. W.A. Rickelton, D. Nucciarone, Proceedings of the Nickel–Cobalt'97 International Symposium, Vol. 1, in: W.C. Cooper, I. Mihaylov (Eds.), The Metallurgical Society of CIM, 1997, p. 275.
2. M. Fujimori, N. Ono, S. Itasako, I. Fukui, Proceedings of the 10th Annual Hydrometallurgical Society of CIM, 1980, paper No. 8.
3. CYANEX 272 Extractant, Technical Brochure SPT-014-B, 1996, Cytec Industries, West Paterson, NJ, available from the author.
4. L.W. Bierman, S.M. Polinsky, D.A. Hempel, R.B. Humberger, Process for the recovery of cadmium and other metals from aqueous solution, U.S. Patent 4,511,541, 1985.
5. S.D. Ukeles, E. Ben-Yoseph, N.P. Finkelstein, Process for the removal of heavy metal ions from phosphoric acid, European Patent Application 0 333 489, 1989.