1. M. Afzal, S.M. Hasany, H. Ahmad, F. Mahmood,J. Radioanal. Nucl. Chem., 170 (1993) 309.
2. S.M. Hasany, M.H. Chaudhary,J. Radioanal. Nucl. Chem., 111 (1987) 199.
3. H. Ahmad, M. Afzal, S.M. Hasany, F. Mahmood,Colloids and Surfaces (1993) (in press).
4. J.B. Basset, R.C. Denney, G.H. Jeffery, J. Mendham, Vogel's Text Book of Quantitative Inorganic Analysis, 4th ed., English Language Book Company and Longman, London, 1978, p. 746.
5. M.R. Jan, A. Hussain,Proc. Natl. Chem. Conf(I) (1989) 226.