[1]JournaloftheAmericanChemicalSociety,1934,vol.56,p.717,718 JournaloftheAmericanChemicalSociety,1937,vol.59,p.899
[1]GazzettaChimicaItaliana,1886,vol.16,p.114
[1]JournaloftheAmericanChemicalSociety,1933,vol.55,p.284,291,293
[1]JournaloftheAmericanChemicalSociety,1934,vol.56,p.717,718 JournaloftheAmericanChemicalSociety,1937,vol.59,p.899