1. Wodcoc, J.T., Austral. Mining, 1981, vol. 73, no. 11, p. 34.
2. Telegina, L.E. and Denisova, O.V., Tsvetn. Metall., 1983, no. 4, p. 19.
3. Telegina, L.E., Kofman, V.Ya., and Mazur, K.V., Tsvetn. Met., 1983, no. 2, p. 96.
4. Laskorin, B.N., Tokarev, N.N., and Vodolazov, L.I., Ionoobmennaya tekhnologiya (Ion-Exchange Technology), Moscow: Nauka, 1965.
5. Laskorin, B.N., Tokarev, N.N., Vyalkov, V.N., et al., Tsvetn. Met., 1967, no. 3, p. 22.