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I.Pippi , FENG Hua-Zhi, LIAN Cui-Hua. . Remote Sensing Technology and Application, 1990, 5(4): 54-57.
http://www.rsta.ac.cn/EN/10.11873/j.issn.1004-0323.1990.4.54 OR http://www.rsta.ac.cn/EN/Y1990/V5/I4/54
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