5JAIN SM,GUPTA PK,NEWTON R J.Somatic embryogenesis in woody P lants[M].1995:335-341.
6GUPTA PK,TIMM ISR,TIMM ISK,CARLSONW,WELTYE.Increase in forestproductivity through biotechnology[A].In:ChopraV L,SinghRB,VermaA (EAs.),Crop P roductivity and Sustainability Shap ing the Future[C],Oxford & IBH Publishing Co.PvtL td.,NewDelh,1998:745-752.
