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Submitted on: 29 April 2012.
Revised on: 12 August 2012.
Accepted on: 30 August 2012.
___________________ENGINEERING COMPUTATIONS---EMERALD GROUP PUBLISHING LTD
Submitted on: 17 June 2014.
Revised on: 12 July 2014.
Accepted on: 30 July 2014.
___________________ENGINEERING COMPUTATIONS---EMERALD GROUP PUBLISHING LTD
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Submitted on: 13 August 2010.
Revised on: 22 October 2010.
Accepted on: 02 November 2010.
___________________ENGINEERING COMPUTATIONS---EMERALD GROUP PUBLISHING LTD
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