Submitted on: 05 October 2003.
Revised on: 29 October 2003.
Accepted on: 23 November 2003.
___________________Econometrics---MDPI
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Submitted on: 06 February 2012.
Revised on: 03 March 2012.
Accepted on: 09 April 2012.
___________________Econometrics---MDPI
Submitted on: 26 January 2005.
Revised on: 18 February 2005.
Accepted on: 26 March 2005.
___________________Econometrics---MDPI
Submitted on: 15 January 1999.
Revised on: 20 March 1999.
Accepted on: 13 April 1999.
___________________Econometrics---MDPI
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