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Submitted on: 03 June 1999.
Revised on: 01 July 1999.
Accepted on: 29 July 1999.
___________________International Journal of Mechanics and Materials in Design
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Submitted on: 27 February 2002.
Revised on: 24 April 2002.
Accepted on: 28 May 2002.
___________________International Journal of Mechanics and Materials in Design
Submitted on: 03 May 2007.
Revised on: 18 July 2007.
Accepted on: 07 September 2007.
___________________International Journal of Mechanics and Materials in Design