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Submitted on: 19 January 2016.
Revised on: 28 February 2016.
Accepted on: 09 April 2016.
___________________Journal of the Serbian Society for Computational Mechanics
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Submitted on: 13 May 2010.
Revised on: 22 June 2010.
Accepted on: 15 July 2010.
___________________Journal of the Serbian Society for Computational Mechanics
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