Submitted on: 30 August 2001.
Revised on: 24 September 2001.
Accepted on: 14 October 2001.
___________________Journal of Inequalities and Special Functions
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Submitted on: 24 June 2007.
Revised on: 23 September 2007.
Accepted on: 05 November 2007.
___________________Journal of Inequalities and Special Functions
Submitted on: 01 October 2005.
Revised on: 10 November 2005.
Accepted on: 28 December 2005.
___________________Journal of Inequalities and Special Functions