1. Mojumdar SC, Varshney KG, Agrawal A (2006) Hybrid fibrous ion exchange materials: past, present and future. Res J Chem Environ 10(1):89–97
2. Sherman JD (1983) Ion exchange separation with molecular sieve zeolites. Molecular sieve department, UCC-Tarrytown technical center, Tarrytown, p 10591
3. Breck DW (1974) Zeolite molecular sieves, structure, chemistry and use. Wiley, New York, p 771
4. Mercer BW, Ames LL, Touhill CJ, Van Slyke WJ, Dean RB (1970) Ammonia removal from secondary effluents by selective ion exchange. JWPCF 42(2), 2: R107
5. Pansini M (1996) Natural zeolites as cation-exchangers for environmental protection. Mineralium Deposita 31(6):563–575