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Submitted on: 19 September 2010.
Revised on: 30 December 2010.
Accepted on: 21 February 2011.
___________________Journal of Econometrics---ELSEVIER SCIENCE SA
Submitted on: 30 November 2010.
Revised on: 20 January 2011.
Accepted on: 04 March 2011.
___________________Journal of Econometrics---ELSEVIER SCIENCE SA
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Submitted on: 23 December 2023.
Revised on: 29 February 2024.
Accepted on: 19 April 2024.
___________________Journal of Econometrics---ELSEVIER SCIENCE SA
Submitted on: 16 May 2007.
Revised on: 25 July 2007.
Accepted on: 12 September 2007.
___________________Journal of Econometrics---ELSEVIER SCIENCE SA