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[2] G. Ulbers. Ein Laser-Interferometer zur photoelektrischen Sewegungsfernmessung in beiden Lateralkoordinaten, Dissertation. 1981. T. U. Hannover

[3] Chengzhi Jiang, Fang Cheng, Lincai Chen. Study on remote measurement technique of displacement or velecity by laser Doppler effect. Proc. SPIE, 1994, 2358: 93～100