[1]JournaloftheChemicalSociety,1952,p.976,981
[1]JournaloftheChemicalSociety,1949,p.1384,1388
[1]JournaloftheChemicalSociety,1927,p.486
[1]TetrahedronLetters,2018,vol.59,p.2145-2149
[2]JournalofHeterocyclicChemistry,1981,vol.18,p.709-714
[3]JournaloftheChemicalSociety,1927,p.486
[4]JournalofOrganicChemistry,1959,vol.24,p.478,481
[5]JournaloftheChemicalSociety,1945,p.530,532
[1]JournaloftheChemicalSociety,1949,p.1384,1388
[2]JournaloftheChemicalSociety,1949,p.1384,1388