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Submitted on: 27 July 2000.
Revised on: 28 September 2000.
Accepted on: 08 November 2000.
___________________Journal of Numerical Mathematics
Submitted on: 19 August 2018.
Revised on: 16 November 2018.
Accepted on: 21 December 2018.
___________________Journal of Numerical Mathematics
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Submitted on: 19 August 2006.
Revised on: 22 November 2006.
Accepted on: 11 December 2006.
___________________Journal of Numerical Mathematics
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