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Submitted on: 02 June 2005.
Revised on: 21 September 2005.
Accepted on: 19 October 2005.
___________________International Journal of Aeronautical and Space Sciences
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Submitted on: 04 February 2004.
Revised on: 01 April 2004.
Accepted on: 08 May 2004.
___________________International Journal of Aeronautical and Space Sciences
Submitted on: 11 April 2013.
Revised on: 19 May 2013.
Accepted on: 25 June 2013.
___________________International Journal of Aeronautical and Space Sciences