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Submitted on: 19 October 2002.
Revised on: 17 January 2003.
Accepted on: 30 January 2003.
___________________Journal of Theoretical and Applied Mechanics
Submitted on: 17 October 2017.
Revised on: 18 November 2017.
Accepted on: 08 January 2018.
___________________Journal of Theoretical and Applied Mechanics
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