Submitted on: 25 December 2014.
Revised on: 22 April 2015.
Accepted on: 10 May 2015.
___________________Facta Universitatis-Series Mechanical Engineering
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Submitted on: 25 January 2005.
Revised on: 27 February 2005.
Accepted on: 16 April 2005.
___________________Facta Universitatis-Series Mechanical Engineering
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