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[1]Bernsteinetal.[JournaloftheAmericanChemicalSociety,1951,vol.73,p.906,908]
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[1]Bradsheretal.[JournalofOrganicChemistry,1958,vol.23,p.618]
[1]Stoutlandetal.[JournalofOrganicChemistry,1959,vol.24,p.818]
[1]Ottman,G.;Hooks,H.[JournalofOrganicChemistry,1966,vol.31,p.838-841]