[1]TetrahedronLetters,1987,vol.28,#15,p.1645-1646
[2]HelveticaChimicaActa,1988,vol.71,p.344-347
[1]HelveticaChimicaActa,1988,vol.71,p.344-347
[2]TetrahedronLetters,1987,vol.28,#15,p.1645-1646
[1]HelveticaChimicaActa,1988,vol.71,p.344-347
[2]TetrahedronLetters,1987,vol.28,#15,p.1645-1646
[1]TetrahedronLetters,1987,vol.28,#15,p.1645-1646
[1]Heterocycles,1987,vol.26,#11,p.2817-2822