Dwivedi, P. C.; Agarwal, Rama, Indian Journal of Chemistry, Section A: Inorganic, Physical, Theoretical and Analytical, 1985, vol. 24, # 12, p. 1015 - 1017
Dwivedi, P. C.; Agarwal, Rama, Indian Journal of Chemistry, Section A: Inorganic, Physical, Theoretical and Analytical, 1985, vol. 24, # 12, p. 1015 - 1017