Sharma, R. C.; Rastogi, M. K., Indian Journal of Chemistry, Section A: Inorganic, Physical, Theoretical and Analytical, 1984, vol. 23, # 5, p. 431 - 433
Sharma, R. C.; Rastogi, M. K., Indian Journal of Chemistry, Section A: Inorganic, Physical, Theoretical and Analytical, 1984, vol. 23, # 5, p. 431 - 433