Submitted on: 04 January 2003.
Revised on: 16 February 2003.
Accepted on: 15 March 2003.
Research in Transportation Business and Management
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Submitted on: 08 March 2018.
Revised on: 31 March 2018.
Accepted on: 24 April 2018.
Research in Transportation Business and Management
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Submitted on: 29 January 2012.
Revised on: 26 February 2012.
Accepted on: 05 March 2012.
Research in Transportation Business and Management
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Submitted on: 17 May 2018.
Revised on: 22 June 2018.
Accepted on: 18 July 2018.
Research in Transportation Business and Management