1. Wastewater Treatment by Ion-Exchange;Bolto,1987
2. Calcium removal from sea water by fixed-bed ion exchange
3. Ion Exchange;Helfferich,1962
4. D. Reichenberg, Selectivity of ion exchange, in: J.A. Marinsky (Ed.), Ion Exchange, A Series of Advances, vol. 1, Buffalo New York, 1966, Chapter 3.