1. M. L. Salutsky, in Comprehensive Analytical Chemistry, Vol. 1c, p. 484 and ff. Editors: C. L. Wilson and D. W. Wilson. Elsevier, London, 1962.
2. J. O. Jepson, and P. Duwez, Trans. Amer. Soc. Metals, 1964. Preprint No. 2, 13 pp.
3. Raluce Repan and Corta Stamsor, Studii. Univ. Babes Bolyai, Ser. Chem., 12 (1967) 7. (cf.C.A., 68, 26582V).
4. C. Mohr, Annalen, 105 (1858) 53.
5. R. A. Chalmers, in Comprehensive Analytical Chem., Vol. 1c, p. 643 (Refs. therein). Editors: C. L. Wilson and D. W. Wilson, Elsevier, London, 1962.