Submitted on: 03 June 2003.
Revised on: 20 August 2003.
Accepted on: 01 October 2003.
___________________Journal of Eta Maritime Science
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Submitted on: 19 August 2007.
Revised on: 13 September 2007.
Accepted on: 27 September 2007.
___________________Journal of Eta Maritime Science
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Submitted on: 05 February 2008.
Revised on: 02 May 2008.
Accepted on: 26 June 2008.
___________________Journal of Eta Maritime Science
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Submitted on: 03 January 2009.
Revised on: 14 February 2009.
Accepted on: 02 April 2009.
___________________Journal of Eta Maritime Science