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2. Xu An-ming. The research about ultra-smooth processing technology of sapphire-wafer, D. Suzhou University, (2006).
3. Wang Jun. Precision grinding process of single crystal sapphire substrate, D. Dalian Science University, 6(2008).
4. Cao Deng-feng. Performance and characteristics research of gas film face seals at low speed, D. Kunming Science University, 7(2006).
5. Sun Jun, Ultra-precision polishing mechanism and processing research of optical crystal materials, D. Changchun University of Technology, 12(2004).