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Submitted on: 11 March 2007.
Revised on: 02 June 2007.
Accepted on: 31 July 2007.
___________________Journal of Applied Engineering Sciences
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Submitted on: 03 August 2006.
Revised on: 03 November 2006.
Accepted on: 22 November 2006.
___________________Journal of Applied Engineering Sciences
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Submitted on: 20 June 2004.
Revised on: 04 August 2004.
Accepted on: 28 September 2004.
___________________Journal of Applied Engineering Sciences
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