Chhipa, R. C.; Singh, A.; Mehrotra, R. C., Indian Journal of Chemistry, Section A: Inorganic, Physical, Theoretical and Analytical, 1990, vol. 29, # 8, p. 792 - 795
Chhipa, R. C.; Singh, A.; Mehrotra, R. C., Indian Journal of Chemistry, Section A: Inorganic, Physical, Theoretical and Analytical, 1990, vol. 29, # 8, p. 792 - 795