1. 1) R. A. Kumbasar, Sep. Purif. Technol., 64, 273–279 (2009).
2. 2) B.R Reddy, C. Parija, B. Sarma, Hydrometallurgy, 53, 11–17 (1999).
3. 3) K. Dimitrov, V. Rollet, A. Saboni, S. Alexandrova, Sep. Sci. Technol., 40, 2111–2123 (2005).
4. 4) R. A. Kumbasar, J. Membrane Sci. 333, 118–124 (2009).
5. 5) G. M. Ritcey, A. W. Ashbrook,. Solvent Extraction: Principles and Applications to Process Metallurgy Part 2 (1979), Elsevier, Amsterdam, Netherlands.