1. Yang Jiping, Xiang Dong, Gao Peng, etc: Journal of mechanical engineering, Vol. 9 (2009), pp.127-135, in Chinese.
2. Zhong Haibing, Xu Songxu, Liu Zhifeng, etc: Journal of mechanical design and manufacturing, Vol. 4 (2008), pp.100-102 in Chinese.
3. Wu Guoqing Zhang Zongke. Proceedings of 2009 China green manufacturing in the New Year, (2009), P. 57- 60 in Chinese.
4. Feldmann K, Scheller H, Proceedings of the 1994 IEEE international symposium on electronics and environment, (1994), pp.81-86.
5. He Yi, Yi Ronghua, Chen Shu etc. Journal of manufacturing automation, Vol. 9 (2011), pp.112-114.