Pandey, K. K.; Agarwala, U. C., Indian Journal of Chemistry, Section A: Inorganic, Physical, Theoretical and Analytical, 1982, vol. 21, # 1, p. 77 - 78
Pandey, K. K.; Agarwala, U. C., Indian Journal of Chemistry, Section A: Inorganic, Physical, Theoretical and Analytical, 1982, vol. 21, # 1, p. 77 - 78