1. Fang Wei, Shaohui Tang and Teluan Chen: submitted to Machine Design and Research, 2001, 17(2): 47-48, in Chinese.
2. Hong Li, Zongjie Zhang: submitted to Chinese Internal Combusion Engine Engineering, 2003, 24(2): 78-79, in Chinese.
3. Bin Li, Yonggang Shi and Guoxu Chen: submitted to Lubricating Oil, 2010, 25(3): 20-25, in Chinese.
4. Yong Li, Zhiyou Liu and Yijie An: submitted to Journal of Hydrodynamics, 2001, 16(2): 254-258, in Chinese.