1. Beetem , W. A. V. J. Janzer J. S. Wahlberg Use of cesium-137 in the determination of cation exchange capacityU. S. Geol. Surv. Bull. 1140-B 1962
2. Ion exchange in clays and other minerals;Carroll;Bull. Geol. Soc. Am.,1959
3. Eichholz , G. G. R. B. Hughes Ann E. Nagel Development of a Rapid Assay Method for Gross Low-Level Radioactivity in Water, Annual Report Atlanta 1964
4. Adsorption of ions in dilute aqueous solutions on glass and plastic surfaces;Eichholz;Anal. Chem.,1965
5. Trace element extraction by mixed ion exchange resins;Eichholz;J. Inorg. Nucl. Chem.,1966