Agarwal, R. K.; Rawat, H. K.; Srivastava, A. K., Indian Journal of Chemistry, Section A: Inorganic, Physical, Theoretical and Analytical, 1988, vol. 27, # 12, p. 1105 - 1108
Agarwal, R. K.; Rawat, H. K.; Srivastava, A. K., Indian Journal of Chemistry, Section A: Inorganic, Physical, Theoretical and Analytical, 1988, vol. 27, # 12, p. 1105 - 1108