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Submitted on: 24 November 2009.
Revised on: 03 February 2010.
Accepted on: 15 February 2010.
___________________ENGINEERING ECONOMIST---TAYLOR & FRANCIS INC
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Submitted on: 20 October 2012.
Revised on: 18 January 2013.
Accepted on: 24 February 2013.
___________________ENGINEERING ECONOMIST---TAYLOR & FRANCIS INC
Submitted on: 11 March 2003.
Revised on: 14 May 2003.
Accepted on: 05 June 2003.
___________________ENGINEERING ECONOMIST---TAYLOR & FRANCIS INC
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