[1]Patent:US2192490,1937,
[1]Patent:US2192490,1937,
[2]Patent:US2192490,1937,
[3]JournaloftheAmericanChemicalSociety,1939,vol.61,p.613,616
[1]JournaloftheAmericanChemicalSociety,1940,vol.62,p.3355
[1]JournaloftheIndianChemicalSociety,1938,vol.15,p.525,528
[2]CanadianJournalofResearch,SectionB:ChemicalSciences,1942,vol.20,p.5,7,9
[3]JournaloftheAmericanChemicalSociety,1938,vol.60,p.1553
[1]JournaloftheChemicalSociety,1947,p.60,62