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Submitted on: 23 February 2001.
Revised on: 15 May 2001.
Accepted on: 02 June 2001.
___________________EURO Journal on Transportation and Logistics
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Submitted on: 19 September 2000.
Revised on: 15 November 2000.
Accepted on: 12 December 2000.
___________________EURO Journal on Transportation and Logistics
Submitted on: 18 July 2015.
Revised on: 15 August 2015.
Accepted on: 12 October 2015.
___________________EURO Journal on Transportation and Logistics
Submitted on: 10 October 2008.
Revised on: 08 November 2008.
Accepted on: 20 November 2008.
___________________EURO Journal on Transportation and Logistics
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Submitted on: 20 June 2015.
Revised on: 17 October 2015.
Accepted on: 31 October 2015.
___________________EURO Journal on Transportation and Logistics
Submitted on: 02 December 2006.
Revised on: 24 February 2007.
Accepted on: 09 March 2007.
___________________EURO Journal on Transportation and Logistics