Singh, P. P.; Yadav, S. P.; Singh, Deepa, Indian Journal of Chemistry, Section A: Inorganic, Physical, Theoretical and Analytical, 1984, vol. 23, # 10, p. 853 - 859
Singh, P. P.; Yadav, S. P.; Singh, Deepa, Indian Journal of Chemistry, Section A: Inorganic, Physical, Theoretical and Analytical, 1984, vol. 23, # 10, p. 853 - 859