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Submitted on: 21 July 2006.
Revised on: 13 October 2006.
Accepted on: 22 November 2006.
___________________JOURNAL OF COMPUTATIONAL PHYSICS
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Submitted on: 09 February 2010.
Revised on: 18 May 2010.
Accepted on: 30 May 2010.
___________________JOURNAL OF COMPUTATIONAL PHYSICS
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