1. Muji Xiang: submitted to Journal of China Science and Technology Information(2004).
2. Zheng Wei: submitted to Journal of Science and Technology Information(2008).
3. Wind Bay: submitted to Journal of Electrical Engineering Technology(2005).
4. Chen Yong: submitted to Journal of Manufacturing Technology & Machine(2000).
5. Liu Zhe: submitted to Journal of Henan Science and Technology(2004).