ACTA AERONAUTICAET ASTRONAUTICA SINICA ›› 2004, Vol. 25 ›› Issue (2): 205-208.
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REN Jun-xue, ZHANG Ding-hua, WANG Zeng-qiang, LIU Wei-wei, WANG Wen-hugy, Education Ministry of China, Northwestern Polytechnical University, Xi'an7007, China)