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Submitted on: 11 November 2002.
Revised on: 08 February 2003.
Accepted on: 05 March 2003.
___________________Journal of Theoretical and Applied Mechanics
Submitted on: 17 October 2010.
Revised on: 11 November 2010.
Accepted on: 26 December 2010.
___________________Journal of Theoretical and Applied Mechanics
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Submitted on: 27 September 2000.
Revised on: 30 October 2000.
Accepted on: 23 December 2000.
___________________Journal of Theoretical and Applied Mechanics