1. Cobble, J. W., in Kolthoff and Elving, Treatise on Analytical Chemistry, Part 2, 6 (Interscience–Wiley, New York, 1963).
2. Kertes, A. S., and Beck, A., Proc. Seventh I.C.C.C., Stockholm, 352 (June 1962).
3. Salaria, G. B. S., Rulfs, C. L., and Elving, P. J., J. Chem. Soc. and Anal. Chem. (in the press), and unpublished results.
4. Rulfs, C. L., Hirsch, R. F., Pacer, R. A., and Kitson, D. A. (unpublished results).