Submitted on: 29 March 2017.
Revised on: 19 May 2017.
Accepted on: 13 June 2017.
___________________International Journal of Sustainable Transportation
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Submitted on: 30 March 2002.
Revised on: 11 July 2002.
Accepted on: 28 August 2002.
___________________International Journal of Sustainable Transportation
Submitted on: 14 October 2000.
Revised on: 27 January 2001.
Accepted on: 21 February 2001.
___________________International Journal of Sustainable Transportation
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