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Submitted on: 20 October 2002.
Revised on: 12 January 2003.
Accepted on: 27 February 2003.
___________________JOURNAL OF COMPUTATIONAL MATHEMATICS
Submitted on: 31 January 2012.
Revised on: 16 May 2012.
Accepted on: 21 June 2012.
___________________JOURNAL OF COMPUTATIONAL MATHEMATICS
Submitted on: 15 August 1999.
Revised on: 28 November 1999.
Accepted on: 06 January 2000.
___________________JOURNAL OF COMPUTATIONAL MATHEMATICS
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Submitted on: 18 September 2015.
Revised on: 09 October 2015.
Accepted on: 10 November 2015.
___________________JOURNAL OF COMPUTATIONAL MATHEMATICS
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Submitted on: 17 May 2002.
Revised on: 19 June 2002.
Accepted on: 10 July 2002.
___________________JOURNAL OF COMPUTATIONAL MATHEMATICS