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Submitted on: 10 September 2008.
Revised on: 14 October 2008.
Accepted on: 07 November 2008.
___________________International Journal of Rotating Machinery
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Submitted on: 21 July 2015.
Revised on: 16 September 2015.
Accepted on: 08 October 2015.
___________________International Journal of Rotating Machinery
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