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Submitted on: 15 May 1999.
Revised on: 24 July 1999.
Accepted on: 27 August 1999.
___________________Electronic Journal of Statistics
Submitted on: 10 May 2004.
Revised on: 12 July 2004.
Accepted on: 17 August 2004.
___________________Electronic Journal of Statistics
Submitted on: 05 March 2017.
Revised on: 02 June 2017.
Accepted on: 29 July 2017.
___________________Electronic Journal of Statistics
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Submitted on: 17 October 2004.
Revised on: 14 December 2004.
Accepted on: 13 January 2005.
___________________Electronic Journal of Statistics