Submitted on: 05 November 2001.
Revised on: 20 February 2002.
Accepted on: 09 April 2002.
___________________European Transport Research Review
Submitted on: 14 January 2007.
Revised on: 30 April 2007.
Accepted on: 26 June 2007.
___________________European Transport Research Review
Submitted on: 04 August 2003.
Revised on: 26 August 2003.
Accepted on: 23 September 2003.
___________________European Transport Research Review
Submitted on: 23 July 2012.
Revised on: 17 November 2012.
Accepted on: 15 December 2012.
___________________European Transport Research Review
Submitted on: 24 September 2006.
Revised on: 08 November 2006.
Accepted on: 20 November 2006.
___________________European Transport Research Review
Submitted on: 31 March 2008.
Revised on: 22 May 2008.
Accepted on: 04 July 2008.
___________________European Transport Research Review
Submitted on: 12 September 2022.
Revised on: 09 November 2022.
Accepted on: 16 December 2022.
___________________European Transport Research Review
Submitted on: 30 September 1998.
Revised on: 10 January 1999.
Accepted on: 06 February 1999.
___________________European Transport Research Review
Submitted on: 23 September 1998.
Revised on: 08 November 1998.
Accepted on: 30 November 1998.
___________________European Transport Research Review
Submitted on: 03 June 2013.
Revised on: 30 June 2013.
Accepted on: 11 August 2013.
___________________European Transport Research Review