[1] W. Gong, J. Zhang, F. Mao, and J. Li, Chin. Opt. Lett. 8, 533 (2010).
[2] N. E. Huang, Z. Shen, S. R. Long, M. C. Wu, H. H. Shih, Q. Zheng, N.-C. Yen, C. C. Tung, and H. H. Liu, Proc. R. Soc. Lond. A 454, 903 (1998).
[3] N. E. Huang and Z. Wu, Rev. Geophys. 46, RG2006 (2008).
[4] S. Wu, Z. Liu, and B. Liu, Opt. Commun. 267, 137 (2006).
[5] F. Zheng, D. Hua, and A. Zhou, Chinese J. Lasers (in Chinese) 36, 1068 (2009).
[6] J. Harms, Appl. Opt. 18, 1559 (1979).
[7] A. O. Boudraa, J. C. Cexus, and Z. Saidi, Int. J. Signal Process. 1, 33 (2004).
[8] Q. Li, G. Zhang, and Y. Liu, Spectrosc. Spect. Anal. (in Chinese) 29, 142 (2009).
[9] D. L. Donoho and I. M. Johnstone, Biometrika 81, 425 (1994).