1. F. E. Beamish, The Analytical Chemistry of the Noble Metals, Oxford: Pergamon. 1966. pp. 77, 79, 271, 409.
2. H. S. Gowda and B. Keshavan, Mikrochim. Acta [Wien]1975 I, 437;1977 I, 211.
3. H. S. Gowda and B. Keshavan, Indian J. Chem.15 A, 762 (1977).
4. B. Keshavan and P. Nagaraja, Microchem. J.30, 175 (1984).
5. B. Keshavan and P. Nagaraja, Indian J. Chem.22 A, 725 (1983).