[1]Beger,J.;Thielemann,C.[JournalfurpraktischeChemie(Leipzig1954),1981,vol.323,#2,p.337-344]
[2]Iwakuraetal.[KogyoKagakuzasshi/JournaloftheSocietyofChemicalIndustry,1955,vol.58,p.67][Chem.Abstr.,1956,p.4008]
[3]Chowdhury,FirozAlam;Nishino,Hiroshi[JournalofHeterocyclicChemistry,2005,vol.42,#7,p.1337-1344]
[1]Iwakuraetal.[KogyoKagakuzasshi/JournaloftheSocietyofChemicalIndustry,1955,vol.58,p.67][Chem.Abstr.,1956,p.4008]
[1]Chowdhury,FirozAlam;Nishino,Hiroshi[JournalofHeterocyclicChemistry,2005,vol.42,#7,p.1337-1344]