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[1]Singh,A.;Narang,K.S.[JournaloftheIndianChemicalSociety,1975,vol.52,p.1187-1189]
[1]Singh,H.etal.[JournaloftheIndianChemicalSociety,1966,vol.43,p.585-588]
[1]Singh,H.etal.[JournaloftheIndianChemicalSociety,1966,vol.43,p.585-588]