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[1]Okamotoetal.[JournaloftheAmericanChemicalSociety,1958,vol.80,p.4969,4971]
[2]CurrentPatentAssignee:MERCK&COINC-US5877191,1999,A
[1]Olah,G.A.etal.[JournaloftheAmericanChemicalSociety,1969,vol.91,#6,p.1458-1469]
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[1]Blakitnyi,A.N.etal.[JournalofOrganicChemistryUSSR(EnglishTranslation),1970,vol.6,#10,p.2063-2067][ZhurnalOrganicheskoiKhimii,1970,vol.6,#10,p.2055-2060]