1. Deshmukh, G. S., and B. R. Sant: J. Indian chem. Soc. 29, 543 (1952); cf. Z. analyt. Chem. 140, 69 (1953).
2. Kolthoff, I. M.: Volumetric Analysis, p. 469, J. Wiley & Sons, New York, 1929.
3. Sant, B. R.: Z. analyt. Chem. 145, 257 (1955).
4. Vogel, A. I.: A Text Book of Quantitative Inorganic Analysis, p. 356, Longmans, Green & Co., London, 1951.