1. P. J. Bailes, C. Hanson and M. A. Hughes: Chemical Engineering, 83(2), 86 (1976).
2. I. I. Ponikaroo et al.: Int. Chem. Eng., 2, 546 (1962).
3. G. M. Ritcey and A. W. Ashbrook: Chapter 5 in Solvent Extraction: Principles and Applications to Process Metallurgy, Part II (Elsevier, Amsterdam, 1979).
4. C. Hanson: Chemical Engineering, 75(18), 98 (1968).
5. E. Barnea: Hydrometallurgy, 5, 15 (1979).