Submitted on: 24 July 2019.
Revised on: 06 September 2019.
Accepted on: 22 October 2019.
___________________International Journal of Applied Mathematics & Statistics
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Submitted on: 16 January 2019.
Revised on: 02 April 2019.
Accepted on: 07 May 2019.
___________________International Journal of Applied Mathematics & Statistics
Submitted on: 23 June 2010.
Revised on: 17 October 2010.
Accepted on: 01 December 2010.
___________________International Journal of Applied Mathematics & Statistics
Submitted on: 30 July 2020.
Revised on: 21 November 2020.
Accepted on: 12 December 2020.
___________________International Journal of Applied Mathematics & Statistics
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