1. π. k, Precision instrument bearing, National Defense Industry Press, Beijing, China (1987) (Chinese).
2. T. Kazuo and S. Toshiro, Rolling bearing engineering, Machinery research and information group, Guizhou, Guiyang, China (1980) (Chinese).
3. S. R. Ge and H. Zhu, Complicate tribological systems and quantitative study methods of their problems, Tribology, 22 (5) (2002) 405–408.
4. Y. S. Zhai, A. Li and J. Z. Zhang, Applied tribology, China University of Petroleum Press, Shandong, China (1996) (Chinese).
5. J. F. Archard, Contact and rubbing of flat surfaces, Journal of Applied Physics, 24 (8) (1953) 981–988.