Siddiqi, K. S.; Khan, N. H.; Kureshy, R. I., Indian Journal of Chemistry, Section A: Inorganic, Physical, Theoretical and Analytical, 1987, vol. 26, # 6, p. 495 - 497
Siddiqi, K. S.; Khan, N. H.; Kureshy, R. I., Indian Journal of Chemistry, Section A: Inorganic, Physical, Theoretical and Analytical, 1987, vol. 26, # 6, p. 495 - 497