[1]Chemicalandpharmaceuticalbulletin,1977,vol.25,p.1708-1716
[1]MonatsheftefurChemie,1991,vol.122,p.413-418
[1]ArchivderPharmazie,1987,vol.320,p.1222-1226
[1]JournalofHeterocyclicChemistry,1988,vol.25,p.119-124
[1]MonatsheftefurChemie,1988,vol.119,p.751-760