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Submitted on: 15 July 2011.
Revised on: 24 October 2011.
Accepted on: 13 December 2011.
___________________JOURNAL OF TRANSPORT ECONOMICS AND POLICY
Submitted on: 11 September 2006.
Revised on: 26 December 2006.
Accepted on: 20 January 2007.
___________________JOURNAL OF TRANSPORT ECONOMICS AND POLICY
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Submitted on: 30 April 2011.
Revised on: 07 July 2011.
Accepted on: 01 September 2011.
___________________JOURNAL OF TRANSPORT ECONOMICS AND POLICY
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