1. G. J. Bridgart, I. R. Wilson,J. Chem. Soc., Dalton Trans, 1281 (1973) and refs therein; V. Lal, V. N. Singh, H. S. Singh, M. P. Singh,Ind. J. Chem.,10, 392 (1972);
2. P. C. Pandey, V. N. Singh, M. P. Singh,Ind. J. Chem.,9, 430 (1971).
3. D. Mohan, D. Gupta, Y. K. Gupta,Inorg. Chem.,10, 1027 (1977) and refs therein; D. Mohan, Y. K. Gupta,J. Chem. Soc., Dalton Trans, 1737 (1975).
4. H. H. Willard, G. D. Manalo,Anal. Chem.,19, 462 (1947); I. M. Kolthoff, W. J. Tomsicek,J. Phys. Chem.,39, 945 (1935); J. D. Winefordner, G. A. Davison,Analyt. Chem. Acta,28, 480 (1963).
5. F. Solymasi, Magyar Kem Folyoirate,63, 294 (1957);Naturwiss,44, 374 (1957); K. Gleu,Z. Anal. Chem.,95, 305 (1933) and other refs given in A. Berka, J. Vulterin, J. Zyka,Newer Redox Titrants, Pergamon Press, 1965, p. 18.