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Submitted on: 25 September 2005.
Revised on: 18 November 2005.
Accepted on: 04 January 2006.
___________________European Journal of Pure and Applied Mathematics
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Submitted on: 28 May 2015.
Revised on: 11 July 2015.
Accepted on: 22 July 2015.
___________________European Journal of Pure and Applied Mathematics
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Submitted on: 23 April 2008.
Revised on: 03 August 2008.
Accepted on: 19 September 2008.
___________________European Journal of Pure and Applied Mathematics
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Submitted on: 10 March 2023.
Revised on: 05 June 2023.
Accepted on: 24 July 2023.
___________________European Journal of Pure and Applied Mathematics
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