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Submitted on: 02 December 2018.
Revised on: 09 March 2019.
Accepted on: 01 May 2019.
___________________COMPUTATIONAL MATHEMATICS AND MATHEMATICAL PHYSICS
Submitted on: 11 July 2017.
Revised on: 07 August 2017.
Accepted on: 15 September 2017.
___________________COMPUTATIONAL MATHEMATICS AND MATHEMATICAL PHYSICS
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