Submitted on: 07 September 2006.
Revised on: 13 December 2006.
Accepted on: 10 January 2007.
___________________JOURNAL OF COMPUTATIONAL MATHEMATICS
Submitted on: 13 March 2017.
Revised on: 23 April 2017.
Accepted on: 06 June 2017.
___________________JOURNAL OF COMPUTATIONAL MATHEMATICS
Submitted on: 16 November 2008.
Revised on: 28 February 2009.
Accepted on: 16 March 2009.
___________________JOURNAL OF COMPUTATIONAL MATHEMATICS
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Submitted on: 21 June 2020.
Revised on: 08 October 2020.
Accepted on: 28 November 2020.
___________________JOURNAL OF COMPUTATIONAL MATHEMATICS
Submitted on: 05 August 2013.
Revised on: 28 November 2013.
Accepted on: 08 January 2014.
___________________JOURNAL OF COMPUTATIONAL MATHEMATICS
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