1. B. Jang, Y.F. Chang, J. Zhu and D.S. Wang: Compressor Technology, (1998)No. 2, p.21. (In Chinese).
2. X.Q. Li and J. Wang: Compressor Technology, (2007) No. 2, p.23. (In Chinese).
3. X.W. Liu, Z.Q. Liu, C. LI and M. Zhao: Compressor Technology, 3(2006), p.1. (In Chinese).
4. X.D. Zhao, X.W. Wu, J.L. Tong and B.C. Li: Science Technology and Engineering. (2009) No. 7, p.1702. (In Chinese).
5. C. Li, Z.Q. Liu and R.Z. Zhao: Journal of Refrigeration, Vol. 27(2006)No. 2, p.44 . (In Chinese).