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Submitted on: 19 September 2005.
Revised on: 05 December 2005.
Accepted on: 20 December 2005.
___________________ARCHIVE FOR RATIONAL MECHANICS AND ANALYSIS
Submitted on: 15 June 2008.
Revised on: 26 August 2008.
Accepted on: 25 September 2008.
___________________ARCHIVE FOR RATIONAL MECHANICS AND ANALYSIS
Submitted on: 15 May 2007.
Revised on: 29 June 2007.
Accepted on: 16 July 2007.
___________________ARCHIVE FOR RATIONAL MECHANICS AND ANALYSIS
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