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Submitted on: 05 September 2007.
Revised on: 29 October 2007.
Accepted on: 17 November 2007.
___________________JOURNAL OF MULTIVARIATE ANALYSIS
Submitted on: 19 June 2015.
Revised on: 27 July 2015.
Accepted on: 20 August 2015.
___________________JOURNAL OF MULTIVARIATE ANALYSIS
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