Submitted on: 25 August 2013.
Revised on: 02 December 2013.
Accepted on: 05 January 2014.
___________________Journal of Eta Maritime Science
Submitted on: 14 December 2019.
Revised on: 04 February 2020.
Accepted on: 29 March 2020.
___________________Journal of Eta Maritime Science
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Submitted on: 14 November 2012.
Revised on: 10 February 2013.
Accepted on: 04 March 2013.
___________________Journal of Eta Maritime Science
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