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Submitted on: 02 March 2013.
Revised on: 16 May 2013.
Accepted on: 29 May 2013.
___________________Journal of Mathematical Extension
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Submitted on: 10 January 2011.
Revised on: 24 February 2011.
Accepted on: 29 March 2011.
___________________Journal of Mathematical Extension
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Submitted on: 14 August 2019.
Revised on: 03 September 2019.
Accepted on: 21 September 2019.
___________________Journal of Mathematical Extension
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