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Submitted on: 18 March 2009.
Revised on: 07 June 2009.
Accepted on: 23 July 2009.
___________________Journal of Materials and Engineering Structures
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Submitted on: 07 August 2008.
Revised on: 02 September 2008.
Accepted on: 02 October 2008.
___________________Journal of Materials and Engineering Structures
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