Submitted on: 30 September 2010.
Revised on: 26 December 2010.
Accepted on: 27 January 2011.
___________________Journal of Mathematical Analysis
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Submitted on: 08 April 2005.
Revised on: 26 May 2005.
Accepted on: 19 July 2005.
___________________Journal of Mathematical Analysis
Submitted on: 11 July 2015.
Revised on: 27 October 2015.
Accepted on: 07 December 2015.
___________________Journal of Mathematical Analysis
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Submitted on: 25 November 1999.
Revised on: 30 December 1999.
Accepted on: 30 January 2000.
___________________Journal of Mathematical Analysis
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Submitted on: 29 December 2002.
Revised on: 28 March 2003.
Accepted on: 15 May 2003.
___________________Journal of Mathematical Analysis
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