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Submitted on: 26 August 1999.
Revised on: 28 November 1999.
Accepted on: 24 January 2000.
___________________Communications in Applied Mathematics and Computational Science
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Submitted on: 08 December 2013.
Revised on: 29 December 2013.
Accepted on: 15 February 2014.
___________________Communications in Applied Mathematics and Computational Science
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Submitted on: 22 February 2024.
Revised on: 06 June 2024.
Accepted on: 27 July 2024.
___________________Communications in Applied Mathematics and Computational Science
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Submitted on: 25 June 2005.
Revised on: 20 September 2005.
Accepted on: 21 October 2005.
___________________Communications in Applied Mathematics and Computational Science