[1]L'abbe,Gerrit;Frederix,Ann[JournalofHeterocyclicChemistry,1990,vol.27,#5,p.1415-1418]
[1]Butler,RichardN.;O'Donoghue,DenisA.[JournaloftheChemicalSociety.PerkintransactionsI,1982,p.1223-1228]
[2]Butler,RichardN.;O'Donoghue,DenisA.[JournaloftheChemicalSociety.PerkintransactionsI,1982,p.1223-1228]
[1]Zmitrovich,N.I.;Petrov,M.L.;Petrov,A.A.[JournalofOrganicChemistryUSSR(EnglishTranslation),1991,vol.27,#7.1,p.1219-1222][ZhurnalOrganicheskoiKhimii,1991,vol.27,#7,p.1394-1398]
[1]Clausen,RasmusP.;Becher,Jan[Tetrahedron,1996,vol.52,#9,p.3171-3188]
[1]Clausen,RasmusP.;Becher,Jan[Tetrahedron,1996,vol.52,#9,p.3171-3188]