Thaker, N. N.; Trivedi, K. N., Indian Journal of Chemistry, Section A: Inorganic, Physical, Theoretical and Analytical, 1981, vol. 20, # 6, p. 560 - 563
Thaker, N. N.; Trivedi, K. N., Indian Journal of Chemistry, Section A: Inorganic, Physical, Theoretical and Analytical, 1981, vol. 20, # 6, p. 560 - 563