Submitted on: 21 February 2023.
Revised on: 29 March 2023.
Accepted on: 24 April 2023.
___________________COMPUTATIONAL MATHEMATICS AND MATHEMATICAL PHYSICS
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Submitted on: 28 September 2002.
Revised on: 10 January 2003.
Accepted on: 23 February 2003.
___________________COMPUTATIONAL MATHEMATICS AND MATHEMATICAL PHYSICS
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