1. C. B. AMPHLETT, 2nd Intern. Conf. Peaceful Uses At. Energy, Geneva 1958, Paper No. 271.
2. K. A. KRAUS, H. O. PHILLIPS, T. A. CARLSON, J. S. JOHNSON, 2nd Intern. Conf. Peaceful Uses At. Energy., Geneva 1958, Paper No. 1832.
3. C. B. AMPHLETT, Inorganic Ion Exchangers, Elsevier New York, 1961.
4. I. S. C. CHURMS, S. African Ind. Chemist, 19 (1965) 26, 48, 68, 87, 148.
5. E. A. MATEROVA, F. A. BELINSKAYA, E. A. MILITSINA, P. A. SKABICHEVSKII, Ionnyi Obmen, Leningrad, Gos. Univ., Leningrad, 1965, p. 3.