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Submitted on: 29 July 2010.
Revised on: 02 October 2010.
Accepted on: 14 November 2010.
___________________Economics of Transportation---ELSEVIER
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Submitted on: 03 August 2016.
Revised on: 06 September 2016.
Accepted on: 01 November 2016.
___________________Economics of Transportation---ELSEVIER
Submitted on: 16 June 2007.
Revised on: 02 October 2007.
Accepted on: 11 November 2007.
___________________Economics of Transportation---ELSEVIER
Submitted on: 11 December 2023.
Revised on: 18 February 2024.
Accepted on: 12 April 2024.
___________________Economics of Transportation---ELSEVIER
Submitted on: 28 October 2016.
Revised on: 19 November 2016.
Accepted on: 06 January 2017.
___________________Economics of Transportation---ELSEVIER
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Submitted on: 27 February 1999.
Revised on: 22 June 1999.
Accepted on: 26 July 1999.
___________________Economics of Transportation---ELSEVIER
Submitted on: 24 June 2009.
Revised on: 19 October 2009.
Accepted on: 02 November 2009.
___________________Economics of Transportation---ELSEVIER