1. Guoquan Wang, Shufeng Wang and Shixiong Li, Qun Yu:submitted to Journal of Shanghai Jiaotong University, 2006, Vol. 40, pp.172-180,in Chinese.
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3. Ke Chen, Gong Wang and Fei Li:submitted to Transactions of Shenyang Ligong University, 2005, Vol. 24, pp.59-70, in Chinese.
4. Renguang Wang, Zhandu Liu and Yuefeng Ma, Zhiquan Qi:submitted to Transactions of the Chinese Society for Agricultural Machinery, 2006, Vol. 37, pp.17-19, in Chinese.
5. Yizhen Lin, Jiashou Hua:submitted to Drive System Technique, 2000, Vol. 13, pp.18-26, in Chinese.