Khan, N. H.; Siddiqi, K. S.; Kureshy, R. I., Indian Journal of Chemistry, Section A: Inorganic, Physical, Theoretical and Analytical, 1987, vol. 26, # 9, p. 763 - 765
Khan, N. H.; Siddiqi, K. S.; Kureshy, R. I., Indian Journal of Chemistry, Section A: Inorganic, Physical, Theoretical and Analytical, 1987, vol. 26, # 9, p. 763 - 765