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Submitted on: 11 September 2013.
Revised on: 09 October 2013.
Accepted on: 19 October 2013.
Public Transport
Submitted on: 19 January 2014.
Revised on: 27 January 2014.
Accepted on: 17 February 2014.
Public Transport
Submitted on: 23 August 2001.
Revised on: 04 September 2001.
Accepted on: 23 September 2001.
Public Transport---SPRINGER HEIDELBERG
Submitted on: 26 May 2015.
Revised on: 15 June 2015.
Accepted on: 28 June 2015.
Public Transport
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