Singh, N. K.; Agarwal, Seema; Aggarwal, R. C., Indian Journal of Chemistry, Section A: Inorganic, Physical, Theoretical and Analytical, 1984, vol. 23, # 2, p. 137 - 139
Singh, N. K.; Agarwal, Seema; Aggarwal, R. C., Indian Journal of Chemistry, Section A: Inorganic, Physical, Theoretical and Analytical, 1984, vol. 23, # 2, p. 137 - 139