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Submitted on: 15 November 2019.
Revised on: 03 January 2020.
Accepted on: 25 January 2020.
___________________COMPUTATIONAL & APPLIED MATHEMATICS
Submitted on: 23 May 2014.
Revised on: 06 August 2014.
Accepted on: 28 August 2014.
___________________COMPUTATIONAL & APPLIED MATHEMATICS
Submitted on: 11 January 2009.
Revised on: 15 April 2009.
Accepted on: 21 May 2009.
___________________COMPUTATIONAL & APPLIED MATHEMATICS