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Submitted on: 18 September 2004.
Revised on: 15 November 2004.
Accepted on: 18 December 2004.
___________________Banach Journal of Mathematical Analysis
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Submitted on: 14 May 2000.
Revised on: 28 August 2000.
Accepted on: 16 October 2000.
___________________Banach Journal of Mathematical Analysis
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Submitted on: 30 November 2011.
Revised on: 12 January 2012.
Accepted on: 24 January 2012.
___________________Banach Journal of Mathematical Analysis
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