[1]Singh,Baldev;Lesher,GeorgeY.[Heterocycles,1990,vol.31,#12,p.2163-2172]
[1]Singh,Baldev;Lesher,GeorgeY.[Heterocycles,1990,vol.31,#12,p.2163-2172]
[1]Singh,Baldev;Lesher,GeorgeY.[Heterocycles,1990,vol.31,#12,p.2163-2172]
[1]Singh,Baldev;Lesher,GeorgeY.[Heterocycles,1990,vol.31,#12,p.2163-2172]