Submitted on: 10 September 2000.
Revised on: 05 November 2000.
Accepted on: 17 November 2000.
___________________International Journal of Numerical Analysis and Modeling
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Submitted on: 30 January 2017.
Revised on: 30 April 2017.
Accepted on: 17 June 2017.
___________________International Journal of Numerical Analysis and Modeling
Submitted on: 05 April 1998.
Revised on: 13 May 1998.
Accepted on: 29 May 1998.
___________________International Journal of Numerical Analysis and Modeling
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