1. E. Bishop, Comprehensive Analytical Chemistry, Vol. 2D, Coulometric Analysis, eds. C. L. Wilson and D. W. Wilson. Amsterdam: Elsevier. 1975.
2. I. P. Alimarin and M. N. Petrikova, Qualitative and Quantitative Ultramicrochemical Analysis. Moscow: Khimiya. 1974.
3. International Review of Sciences: Analytical Chemistry, Part 2, ed. T. S. West, London: Butterworths. 1976. p. 187.
4. C. Reilley and W. Porterfield, Analyt. Chemistry28, 443 (1956).
5. T. A. Kokina, M. N. Petrikova and I. P. Alimarin, Zh. Analit. Khim.32, 1936 (1977).