Submitted on: 10 March 2005.
Revised on: 08 April 2005.
Accepted on: 06 May 2005.
___________________International Journal of Shipping and Transport Logistics
Submitted on: 17 January 2009.
Revised on: 15 February 2009.
Accepted on: 14 April 2009.
___________________International Journal of Shipping and Transport Logistics
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Submitted on: 30 August 2014.
Revised on: 05 November 2014.
Accepted on: 15 December 2014.
___________________International Journal of Shipping and Transport Logistics
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