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Submitted on: 30 September 1999.
Revised on: 17 December 1999.
Accepted on: 07 February 2000.
___________________Communications on Applied Mathematics and Computation
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Submitted on: 26 September 2009.
Revised on: 18 November 2009.
Accepted on: 25 December 2009.
___________________Communications on Applied Mathematics and Computation
Submitted on: 24 December 1998.
Revised on: 07 February 1999.
Accepted on: 14 March 1999.
___________________Communications on Applied Mathematics and Computation
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Submitted on: 06 December 2021.
Revised on: 16 March 2022.
Accepted on: 29 March 2022.
___________________Communications on Applied Mathematics and Computation
Submitted on: 04 June 2009.
Revised on: 03 September 2009.
Accepted on: 10 October 2009.
___________________Communications on Applied Mathematics and Computation