[1]JournaloftheChemicalSociety,1956,p.307,308
[1]ChemistryofHeterocyclicCompounds,1971,vol.7,p.1574-1576 KhimiyaGeterotsiklicheskikhSoedinenii,1971,vol.7,p.1692-1694
[1]IndianJournalofChemistry-SectionBOrganicandMedicinalChemistry,1982,vol.21,p.928-940
[1]MagneticResonanceinChemistry,1991,vol.29,p.1147-1151
[1]CanadianJournalofChemistry,1993,vol.71,p.427-432