Ullah, S. S.; Azam, K. A.; Hashem, M. A., Indian Journal of Chemistry, Section A: Inorganic, Physical, Theoretical and Analytical, 1987, vol. 26, # 10, p. 831 - 833
Khan, S. M. A.; Hashem, M. A.; Karim, M. M., Indian Journal of Chemistry, Section A: Inorganic, Physical, Theoretical and Analytical, 1985, vol. 24, # 7, p. 607
作者:Khan, S. M. A.、Hashem, M. A.、Karim, M. M.、Ullah, S. S.