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Submitted on: 25 December 2000.
Revised on: 02 March 2001.
Accepted on: 30 April 2001.
___________________International Journal of Mechanics and Materials in Design
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Submitted on: 09 November 2001.
Revised on: 17 January 2002.
Accepted on: 13 March 2002.
___________________International Journal of Mechanics and Materials in Design