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Submitted on: 23 June 2022.
Revised on: 23 September 2022.
Accepted on: 15 November 2022.
___________________Journal of Mathematics---HINDAWI LTD
Submitted on: 13 October 2010.
Revised on: 30 November 2010.
Accepted on: 18 January 2011.
___________________Journal of Mathematics---HINDAWI LTD
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Submitted on: 14 January 2018.
Revised on: 25 February 2018.
Accepted on: 20 March 2018.
___________________Journal of Mathematics---HINDAWI LTD
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