1. C. Musikas,Sep. Sci. Technol., 23 (12, 13) (1988) 1211.
2. G.M. Nair, D.R. Prabhu, G.R. Mahajan et al.,Sol. Extr. Ion Exch., 11 (1993) 813.
3. C. Cuillerdier, C. Musikas, P. Hoel et al.,Sep. Sci. Technol., 26 (1991) 1229.
4. R.S. Stanley, K. Wolf, Organic Functional Group Preparations, Vol. I, Academic Press, New York (1968) p. 277.
5. Heshen Qian, Yuan Xia,Atom. Energ. Sci. Technol. (in Chinese), 20 (3) (1986) 302.