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Submitted on: 16 October 2006.
Revised on: 09 February 2007.
Accepted on: 25 February 2007.
___________________Computational Methods in Applied Mathematics
Submitted on: 10 November 2002.
Revised on: 14 December 2002.
Accepted on: 16 January 2003.
___________________Computational Methods in Applied Mathematics
Submitted on: 30 September 2017.
Revised on: 06 December 2017.
Accepted on: 20 December 2017.
___________________Computational Methods in Applied Mathematics
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Submitted on: 20 January 2005.
Revised on: 22 March 2005.
Accepted on: 19 April 2005.
___________________Computational Methods in Applied Mathematics
Submitted on: 17 October 2013.
Revised on: 21 November 2013.
Accepted on: 02 December 2013.
___________________Computational Methods in Applied Mathematics
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