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Submitted on: 29 October 2005.
Revised on: 25 November 2005.
Accepted on: 30 December 2005.
___________________Journal of Econometrics---ELSEVIER SCIENCE SA
Submitted on: 05 June 2017.
Revised on: 20 August 2017.
Accepted on: 08 September 2017.
___________________Journal of Econometrics---ELSEVIER SCIENCE SA
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Submitted on: 09 January 2007.
Revised on: 14 February 2007.
Accepted on: 08 April 2007.
___________________Journal of Econometrics---ELSEVIER SCIENCE SA