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Submitted on: 26 January 2008.
Revised on: 04 February 2008.
Accepted on: 26 February 2008.
TRANSPORTATION JOURNAL
Submitted on: 15 May 2015.
Revised on: 25 June 2015.
Accepted on: 22 July 2015.
TRANSPORTATION JOURNAL---PENN STATE UNIV PRESS
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Submitted on: 06 September 1998.
Revised on: 11 October 1998.
Accepted on: 16 October 1998.
TRANSPORTATION JOURNAL---PENN STATE UNIV PRESS
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Submitted on: 27 April 2001.
Revised on: 05 June 2001.
Accepted on: 30 June 2001.
TRANSPORTATION JOURNAL
Submitted on: 25 September 2000.
Revised on: 11 October 2000.
Accepted on: 05 November 2000.
TRANSPORTATION JOURNAL---PENN STATE UNIV PRESS
Submitted on: 03 August 2006.
Revised on: 14 September 2006.
Accepted on: 05 October 2006.
TRANSPORTATION JOURNAL
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