1. Zeolite removal of ammonium ions from agricultural and other waste waters;Ames,1967
2. Water purification by ion exchange;Arden,1968
3. Exchange of sodium in clinoptilolite by organic cations;Barrer;J. Inorg. Nucl. Chem.,1967
4. Ammonia removal from agricultural runoff and secondary effluents by selective ion exchange;Battelle Memorial Institute;Robert A. Taft Water Research Center Rep. No. TWRC-5,1969