Submitted on: 06 October 2019.
Revised on: 18 December 2019.
Accepted on: 29 December 2019.
___________________International Journal of Transport Economics
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Submitted on: 15 October 2017.
Revised on: 20 January 2018.
Accepted on: 20 February 2018.
___________________International Journal of Transport Economics
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Submitted on: 10 July 2002.
Revised on: 21 August 2002.
Accepted on: 19 September 2002.
___________________International Journal of Transport Economics
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Submitted on: 26 September 2019.
Revised on: 02 January 2020.
Accepted on: 01 February 2020.
___________________International Journal of Transport Economics
Submitted on: 13 February 2010.
Revised on: 08 March 2010.
Accepted on: 22 April 2010.
___________________International Journal of Transport Economics
Submitted on: 02 February 2006.
Revised on: 12 April 2006.
Accepted on: 29 April 2006.
___________________International Journal of Transport Economics