Submitted on: 13 June 2012.
Revised on: 17 August 2012.
Accepted on: 22 September 2012.
___________________International Journal of Multiphysics
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Submitted on: 19 December 2004.
Revised on: 17 February 2005.
Accepted on: 27 March 2005.
___________________International Journal of Multiphysics
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