1. M.P. Zverew, Chemosorptive Fibres, Khimiya, Moscow, 1981, p. 191 (in Russian).
2. L.A. Wolf, Fibres of Specific Properties, Khimiya, Moscow, 1980, p. 240 (in Russian).
3. I.N. Ermolenbo, E.D. Bugalov, I.P. Lyublinder, S.R. Dogetev, Nanka'i Tebhniba, Minsk, 1975, p. 215 (in Russian).
4. Fibrous Ion-Exchanger and its Application