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[1]ChemischeBerichte,1932,vol.65,p.1382,1392
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[1]JournaloftheAmericanChemicalSociety,1939,vol.61,p.1365,1369
[1]JournaloftheAmericanChemicalSociety,1934,vol.56,p.1415
[2]IowaStateCollegeJournalofScience,1943,vol.18,p.98,99