1. 1) Gregor, H. P.: J. Amer. Chem. Soc., 70, 1293 (1948)
2. 2) Helfferich, F.: “Ion Exchange,” McGraw-Hill, New York (1962)
3. Deionization Equilibria between Mixed Cation and Anion Exchange Resins and a Dilute NaCl Solution.
4. 4) Konrad, D., ed.: “Ion Exchangers,” Walter de Gruyter Berlin, New York (1991)
5. 5) Marinsky, J. A. and Y. Marcus, ed.: “Ion Exchange and Solvent Extraction,” volum 9, p. 10–12, 23–24, Marcel Dekker Inc., New York and Basel (1985)