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Submitted on: 07 April 2015.
Revised on: 22 July 2015.
Accepted on: 16 August 2015.
___________________COMPUTERS & FLUIDS---PERGAMON-ELSEVIER SCIENCE LTD
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Submitted on: 29 July 2010.
Revised on: 03 November 2010.
Accepted on: 26 November 2010.
___________________COMPUTERS & FLUIDS---PERGAMON-ELSEVIER SCIENCE LTD