Singh, A. K.; Puri, B. K.; Rawlley, R. K., Indian Journal of Chemistry, Section A: Inorganic, Physical, Theoretical and Analytical, 1989, vol. 28, # 1, p. 59 - 62
Singh, A. K.; Puri, B. K.; Rawlley, R. K., Indian Journal of Chemistry, Section A: Inorganic, Physical, Theoretical and Analytical, 1989, vol. 28, # 1, p. 59 - 62