Submitted on: 13 September 2012.
Revised on: 20 October 2012.
Accepted on: 08 November 2012.
Research in Transportation Economics
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Submitted on: 12 February 2009.
Revised on: 06 March 2009.
Accepted on: 27 March 2009.
Research in Transportation Economics
Submitted on: 15 January 2003.
Revised on: 20 February 2003.
Accepted on: 28 February 2003.
Research in Transportation Economics
Submitted on: 28 November 2015.
Revised on: 05 December 2015.
Accepted on: 25 December 2015.
Research in Transportation Economics
Submitted on: 31 May 2007.
Revised on: 24 June 2007.
Accepted on: 19 July 2007.
Research in Transportation Economics
Submitted on: 29 March 2008.
Revised on: 27 April 2008.
Accepted on: 07 May 2008.
Research in Transportation Economics