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Submitted on: 06 November 2005.
Revised on: 21 February 2006.
Accepted on: 20 April 2006.
___________________International Journal of Numerical Analysis and Modeling
Submitted on: 10 May 2011.
Revised on: 28 July 2011.
Accepted on: 17 August 2011.
___________________International Journal of Numerical Analysis and Modeling
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Submitted on: 27 December 2011.
Revised on: 18 April 2012.
Accepted on: 13 June 2012.
___________________International Journal of Numerical Analysis and Modeling
Submitted on: 16 September 2016.
Revised on: 02 December 2016.
Accepted on: 25 January 2017.
___________________International Journal of Numerical Analysis and Modeling
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