1. U.S. Pat. 1,913,702.
2. U.S. Pat. 2,830,945.
3. F.A. Keidel, Pittsburgh Conference on Analytical Chemistry and Applied Spectroscopy, (February, 1956).
4. E.S. Taylor, American Society of Refrigerating Engineers Meeting, Cincinnati, Ohio, (June, 1956).
5. Determination of Water by Direct Amperometric Measurement