1. Determination of Sodium and Potassium, Employing Ion-Exchange Separation;Beukenkamp;Anal. Chem.,1950
2. Rapid Determination of Potassium and Sodium in Plant Materials and Soil Extracts by Flame Photometer;Brown;Proc. Am. Soc. Hort. Sci.,1946
3. The Determination of Calcium and Magnesium in Leaves Using Flame Methods and a Quartz Spectophotometer;Brown;Proc. Am. Soc. Hort. Sci.,1948
4. Ion-Exchange Separation of the Alkali Metals;Cohn;J. Am. Chem. Soc,1948
5. Stable Internal Standard Flame Photometer;Fox;Anal. Chem.,1951