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ACTA AERONAUTICAET ASTRONAUTICA SINICA ›› 2000, Vol. 21 ›› Issue (2): 191-192.

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YANG Shu-chi, QIAO Zhi-de   

  1. Northwestern Poly technical University, Xi'an 710072, China
  • Received:1998-09-15 Revised:1999-05-10 Online:2000-04-25 Published:2000-04-25