5Yoda K. Self-thinning in overcrowded pure stands under cultivated and nature conditions[J]. J Biol Osaya City Univ,1963, 14:107-129.
6Drew T J, Flewelling J W. Some recent Japamese theories of yield density relationships and their application to Montery pine plantations[J]. For sec, 1977, 23(4):517-534.