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Submitted on: 24 June 2012.
Revised on: 16 August 2012.
Accepted on: 31 August 2012.
___________________Computational Methods in Applied Mathematics
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Submitted on: 15 May 1999.
Revised on: 18 August 1999.
Accepted on: 24 September 1999.
___________________Computational Methods in Applied Mathematics
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