1. The application of clinoptilolite for ammonium removal;Ames,1967
2. Toft, R. A. Water Research Center Report No. TWRC-5;Batelle Northwest Ammonia Removal from Agricultural Rinsoff,1969
3. Theory of membrane equilibria;Donnan;Chem. Rev.,1925
4. Model for exchange resins;Harris;J. chem. Phys.,1956
5. Ion Exchange;Helfferich,1969