1. Liu Xiongwei: The processing theory and programming technique in CNC (China Machine Press, Beijing, 1994).
2. Zhou Ji, Zhou Yanhong: Technology of NC machining (National Defense Industry Press, Beijing, 2002).
3. He Yonghong, Qi Lehua, Zhao Baolin: Manufacturing Technology & Machine Tool Issue 1(2006), p.9.
4. Zhao Wei, Gao Chun, Ma Yue, etc: Journal of Chinese Computer Systems Vol. 29(2008), p.980.
5. Wu Dazhong, Wang Yuhan, Feng Jingchun, etc: Journal of Shanghai Jiaotong University Vol. 41(2007), p.1608.