1. Kojimia, I. and Takayanagi, A., J. Anal. At. Spectrom., 1996, vol. 11, no. 3, p. 213.
2. Silver Institute Letter, Silver Purifies Water, on Drilling Rigs, 1997, vol. 7, no. 1, p. 10.
3. Chiba, K., Inamoto, I., and Saelei, M., J. Anal. At. Spectrom., 1992, vol. 7, no. 2, p. 115.
4. Grajson, M., Kirk-Othemer Encyclopedia of Chemical Technology, New York: Wiley, 1980, vol. 21, 3rd ed.
5. Kolthoff, I.M. and Eiving, P.J., Treatise on Analytical Chemistry, New York: Interscience, 1966, vol. 5, part II.