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Submitted on: 20 April 2003.
Revised on: 28 May 2003.
Accepted on: 15 July 2003.
___________________JOURNAL OF AEROSPACE ENGINEERING
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Submitted on: 14 August 2009.
Revised on: 15 September 2009.
Accepted on: 28 October 2009.
___________________JOURNAL OF AEROSPACE ENGINEERING
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