Submitted on: 08 May 2007.
Revised on: 04 June 2007.
Accepted on: 20 June 2007.
Propulsion and Power Research
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Submitted on: 19 December 2011.
Revised on: 11 January 2012.
Accepted on: 25 January 2012.
Propulsion and Power Research---KEAI PUBLISHING LTD
Submitted on: 21 June 2008.
Revised on: 02 August 2008.
Accepted on: 25 August 2008.
Propulsion and Power Research
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