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2. K. M. Saldadze and V. D. Kopylova-Valova, Compexing Ion Exchangers (Khimiya, Moscow, 1980) [in Russian].
3. Ion Exchangers in Non-Ferrous Metallurgy, Ed. by K. B. Lebedev (Metallurgiya, Moscow, 1975) [in Russian].
4. Ion Exchangers in Chemical Technology, Ed. by B. P. Nikol’skii and P. G. Romankov (Khimiya, Leningrad, 1982) [in Russian].
5. N. M. Sobinyakova, Tr. VIMS, No. 23, 5985 (1972).