Submitted on: 30 December 2013.
Revised on: 28 April 2014.
Accepted on: 07 June 2014.
___________________Electronic Markets---SPRINGER HEIDELBERG
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Submitted on: 21 August 2007.
Revised on: 21 September 2007.
Accepted on: 20 November 2007.
___________________Electronic Markets---SPRINGER HEIDELBERG
Submitted on: 03 September 2019.
Revised on: 22 December 2019.
Accepted on: 14 February 2020.
___________________Electronic Markets---SPRINGER HEIDELBERG
Submitted on: 30 January 2004.
Revised on: 30 March 2004.
Accepted on: 23 May 2004.
___________________Electronic Markets---SPRINGER HEIDELBERG
Submitted on: 10 July 2015.
Revised on: 23 August 2015.
Accepted on: 12 September 2015.
___________________Electronic Markets---SPRINGER HEIDELBERG
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Submitted on: 11 March 1999.
Revised on: 08 April 1999.
Accepted on: 18 May 1999.
___________________Electronic Markets---SPRINGER HEIDELBERG
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