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Submitted on: 05 August 2010.
Revised on: 08 September 2010.
Accepted on: 19 September 2010.
___________________Journal of Aerospace Technology and Management
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Submitted on: 12 January 2004.
Revised on: 04 April 2004.
Accepted on: 12 May 2004.
___________________Journal of Aerospace Technology and Management