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Submitted on: 09 January 2001.
Revised on: 20 January 2001.
Accepted on: 29 January 2001.
TRANSPORTATION RESEARCH PART D-TRANSPORT AND ENVIRONMENT
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Submitted on: 10 July 2019.
Revised on: 15 August 2019.
Accepted on: 21 August 2019.
TRANSPORTATION RESEARCH PART D-TRANSPORT AND ENVIRONMENT
Submitted on: 20 April 2002.
Revised on: 02 May 2002.
Accepted on: 28 May 2002.
TRANSPORTATION RESEARCH PART D-TRANSPORT AND ENVIRONMENT
Submitted on: 03 September 2006.
Revised on: 11 September 2006.
Accepted on: 17 September 2006.
TRANSPORTATION RESEARCH PART D-TRANSPORT AND ENVIRONMENT