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Submitted on: 02 March 2012.
Revised on: 22 May 2012.
Accepted on: 06 July 2012.
___________________Journal of Mathematical Inequalities
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Submitted on: 24 December 2011.
Revised on: 09 March 2012.
Accepted on: 10 April 2012.
___________________Journal of Mathematical Inequalities
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Submitted on: 29 September 2008.
Revised on: 01 November 2008.
Accepted on: 02 December 2008.
___________________Journal of Mathematical Inequalities
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