Singh, B.; Singh, R. N.; Aggarwal, R. C., Indian Journal of Chemistry, Section A: Inorganic, Physical, Theoretical and Analytical, 1984, vol. 23, # 12, p. 1016 - 1020
Singh, B.; Singh, R. N.; Aggarwal, R. C., Indian Journal of Chemistry, Section A: Inorganic, Physical, Theoretical and Analytical, 1984, vol. 23, # 12, p. 1016 - 1020