Siddiqi, K. S.; Tabassum, S.; Zaidi, S. A. A., Indian Journal of Chemistry, Section A: Inorganic, Physical, Theoretical and Analytical, 1989, vol. 28, # 1, p. 83 - 85
Siddiqi, K. S.; Tabassum, S.; Zaidi, S. A. A., Indian Journal of Chemistry, Section A: Inorganic, Physical, Theoretical and Analytical, 1989, vol. 28, # 1, p. 83 - 85