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Submitted on: 17 November 2012.
Revised on: 21 February 2013.
Accepted on: 07 April 2013.
___________________Journal of Eta Maritime Science
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Submitted on: 09 March 2020.
Revised on: 22 April 2020.
Accepted on: 07 May 2020.
___________________Journal of Eta Maritime Science
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