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Submitted on: 28 December 2014.
Revised on: 08 April 2015.
Accepted on: 29 April 2015.
___________________INTERNATIONAL JOURNAL OF MATHEMATICS AND MATHEMATICAL SCIENCES
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Submitted on: 28 December 2018.
Revised on: 17 April 2019.
Accepted on: 20 May 2019.
___________________INTERNATIONAL JOURNAL OF MATHEMATICS AND MATHEMATICAL SCIENCES
Submitted on: 09 July 2008.
Revised on: 31 July 2008.
Accepted on: 15 August 2008.
___________________INTERNATIONAL JOURNAL OF MATHEMATICS AND MATHEMATICAL SCIENCES