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Submitted on: 15 October 2009.
Revised on: 03 February 2010.
Accepted on: 05 March 2010.
___________________JOURNAL OF ENGINEERING DESIGN---TAYLOR & FRANCIS LTD
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Submitted on: 12 November 2008.
Revised on: 16 December 2008.
Accepted on: 10 January 2009.
___________________JOURNAL OF ENGINEERING DESIGN---TAYLOR & FRANCIS LTD
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