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Submitted on: 29 July 2008.
Revised on: 28 October 2008.
Accepted on: 22 November 2008.
___________________International Journal of Manufacturing Materials and Mechanical Engineering
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Submitted on: 22 April 2002.
Revised on: 19 May 2002.
Accepted on: 10 June 2002.
___________________International Journal of Manufacturing Materials and Mechanical Engineering