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Submitted on: 10 January 2008.
Revised on: 18 March 2008.
Accepted on: 30 March 2008.
___________________International Journal of Fluid Power
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Submitted on: 19 July 2013.
Revised on: 18 September 2013.
Accepted on: 10 November 2013.
___________________International Journal of Fluid Power
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