Submitted on: 11 June 2003.
Revised on: 07 September 2003.
Accepted on: 30 October 2003.
___________________Computational Economics---SPRINGER
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Submitted on: 30 July 2001.
Revised on: 27 August 2001.
Accepted on: 14 September 2001.
___________________Computational Economics---SPRINGER
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Submitted on: 07 June 2015.
Revised on: 02 August 2015.
Accepted on: 01 October 2015.
___________________Computational Economics---SPRINGER
Submitted on: 03 September 2016.
Revised on: 19 November 2016.
Accepted on: 17 December 2016.
___________________Computational Economics---SPRINGER
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Submitted on: 10 July 2011.
Revised on: 18 October 2011.
Accepted on: 05 November 2011.
___________________Computational Economics---SPRINGER