5Proceeding of First,Second and Third Consultations on Forest Tree Breeding,1963,1969,1997.
6Proceeding of conference of IUFRO wording parties on breeding theory,progeny testing,seed orchards,1986,N.C.State University.
7Davies W J,Zhang Jianhua.Root singal and the regulation of growth and development of plants in dring soil.Annu Rev Plant physiol Plant Mol Biol,1991,42,55~76