[1]JournalofHeterocyclicChemistry,1984,vol.21,p.753-757
[1]JournalofHeterocyclicChemistry,1984,vol.21,p.753-757
[1]JournalofHeterocyclicChemistry,1984,vol.21,p.753-757
[1]Heterocycles,2002,vol.57,p.2393-2400
[1]Heterocycles,2002,vol.57,p.2393-2400