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[2] L. E. Drain, The Laser Doppler Technique (in Chinese) (Tsinghua University Press, Beijing, 1980) p. 105, p. 137.
[3] B. K. Zhou, Y. Z. Gao, and J. H. Chen, Principles of Laser (in Chinese) (National Defence Industry Press, Beijing, 1980) p. 349, p. 357.