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Vol.41(1993), p.370 [8] Dongzhi Chen, Jianmeng Chen and Weihong Zhong: Bioresource technol Vol.99 (2008),p. 4702 [9] Hojae Shim and Shang-Tian Yang: Biotechnology Vol.67 (1999), p. 99 [10]Wang ping and Zhou Qixing: Chinese Journal of Ecology Vol.28 (2009), p.329 [11]Mai Wenning and Gu Xiasheng: Journal of Zhengzhou Institute of technology Vol.16(1995), p.32 [12]Lee K.

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[10] Rongjun Zhao, Peihua Yang, Bin Xie, Yafang Lei, Dejun Feng, A Study on Wood Structure and Physical and Mechanical Properties of the Half-Sib Progeny and Parent of Pinus Tabulaeformis Carr, Journal of Northwest Forestry University. 2 (2000), 24-28.

[12] Huang hui-ning, Liu yuan-zhang, Liang zhao yang.
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Shandong Traffic Technology, 2007 (4):65-67 (in Chinese) [5] Tian Xiaofeng, Yang Zhibo, Hou Haobo.

Tian, X.L.
Yang, J.Hu, and S.

[4] Weiping Tan, Xinhua Yang, Chuanyao Chen.
[5] Xiuli Du, Ruito Da, Yijiang Peng, Yudong Tian.

[7] Zhang mengtao.Rockburst instability theory and numerical simulation[J].Chinese Journal Rock Mechanics and Engineering, 1987, 6(3)：197-204 [8] Xie heping, Peng ruidong, Ju yang, et al..On energy analysis of rock failure.
[11] Zhao yixin, Jiang yaodong, Tian supeng.

Liua, F.Yang, C.
Tian, Z.

[10] Yin-nan YUAN, Tian ZHANG, De-qing MEI, etc.
[16] Wei HAN, Mei YANG, Chang-sheng LIU, etc.

Yang, Z.
Tian, Y.N.