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Submitted on: 02 August 2004.
Revised on: 20 November 2004.
Accepted on: 04 January 2005.
___________________Computational Economics---SPRINGER
Submitted on: 21 February 2002.
Revised on: 24 April 2002.
Accepted on: 06 June 2002.
___________________Computational Economics---SPRINGER
Submitted on: 21 August 2013.
Revised on: 03 November 2013.
Accepted on: 25 November 2013.
___________________Computational Economics---SPRINGER
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