Haque, A. K. M. M.; Kabir, S. E.; Kazi, A. B., Indian Journal of Chemistry, Section A: Inorganic, Physical, Theoretical and Analytical, 1990, vol. 29, # 1, p. 25 - 27
Haque, A. K. M. M.; Kabir, S. E.; Kazi, A. B., Indian Journal of Chemistry, Section A: Inorganic, Physical, Theoretical and Analytical, 1990, vol. 29, # 1, p. 25 - 27