1. Liang Huang. M. Aviation Industry Press, vol. 7(1993).
2. Yunbo Wang, Guankang Zhang, Zonglv Feng and so on. M. Beijing: National Defense Industry Press, vol. 8(1990).
3. Xiaohua Ren. J. Aeronautical Manufacturing Technology, vol. 12(2005), p.32, (In Chinese).
4. Liwen Bi, Xiaodong Tang, Hongyu Yang. J. Aeronautical Manufacturing, vol. 20(2008), p.48.