Submitted on: 17 October 2021.
Revised on: 30 December 2021.
Accepted on: 11 February 2022.
___________________Electronic Markets---SPRINGER HEIDELBERG
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Submitted on: 17 April 2011.
Revised on: 14 June 2011.
Accepted on: 04 August 2011.
___________________Electronic Markets---SPRINGER HEIDELBERG
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Submitted on: 14 September 2005.
Revised on: 10 December 2005.
Accepted on: 24 December 2005.
___________________Electronic Markets---SPRINGER HEIDELBERG
Submitted on: 28 March 2005.
Revised on: 20 July 2005.
Accepted on: 16 August 2005.
___________________Electronic Markets---SPRINGER HEIDELBERG
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Submitted on: 07 February 2002.
Revised on: 13 March 2002.
Accepted on: 07 May 2002.
___________________Electronic Markets---SPRINGER HEIDELBERG