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[1]Bentetal.[JournaloftheAmericanChemicalSociety,1951,vol.73,p.3100,3101]
[1]Sacharowa;Chromow-Borisow[ZhurnalObshcheiKhimii,1960,vol.30,p.1805,181ss][J.Gen.Chem.USSR(Engl.Transl.),1960,vol.30,p.1788,1792]
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[1]Singh[JournaloftheIndianChemicalSociety,1939,vol.16,p.19,25]