Submitted on: 26 January 2009.
Revised on: 14 April 2009.
Accepted on: 06 June 2009.
___________________International Journal of Transport Economics
Submitted on: 03 November 2015.
Revised on: 28 December 2015.
Accepted on: 09 February 2016.
___________________International Journal of Transport Economics
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Submitted on: 07 June 2000.
Revised on: 23 July 2000.
Accepted on: 08 August 2000.
___________________International Journal of Transport Economics
Submitted on: 04 May 2023.
Revised on: 29 August 2023.
Accepted on: 04 October 2023.
___________________International Journal of Transport Economics
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