1. R. I. Edwards , W. A. M. te Riele ,in Handbook of Solvent Extraction. T. C. Lo, M. H. I. Baird and C. Hanson, Eds. , John Wiley and Sons , New York , 1983 , p. 725
2. V. A. Mikhailov ,in Proc. ISEC,77, Toronto, CIM Special Volume 21, Canadian Institute of Mining and Metallurgy , Montreal , 1979 , p. 52
3. R. I. Edwards ,in Proc. ISEC'77, Toronto, CIM Special Volume 21. Canadien Institute of Mining and Metallurgy , Montreal , 1979 , p. 24