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Submitted on: 30 January 2008.
Revised on: 16 April 2008.
Accepted on: 25 May 2008.
___________________Journal of Econometrics---ELSEVIER SCIENCE SA
Submitted on: 14 January 2005.
Revised on: 30 April 2005.
Accepted on: 18 June 2005.
___________________Journal of Econometrics---ELSEVIER SCIENCE SA
Submitted on: 12 August 2002.
Revised on: 26 October 2002.
Accepted on: 20 December 2002.
___________________Journal of Econometrics---ELSEVIER SCIENCE SA
Submitted on: 19 February 1998.
Revised on: 27 March 1998.
Accepted on: 10 May 1998.
___________________Journal of Econometrics---ELSEVIER SCIENCE SA
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