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Submitted on: 11 June 2001.
Revised on: 13 August 2001.
Accepted on: 21 September 2001.
___________________Journal of Contemporary Mathematical Analysis-Armenian Academy of Sciences
Submitted on: 12 January 2012.
Revised on: 08 March 2012.
Accepted on: 20 March 2012.
___________________Journal of Contemporary Mathematical Analysis-Armenian Academy of Sciences
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Submitted on: 09 October 2008.
Revised on: 30 October 2008.
Accepted on: 21 December 2008.
___________________Journal of Contemporary Mathematical Analysis-Armenian Academy of Sciences
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Submitted on: 30 March 1999.
Revised on: 08 July 1999.
Accepted on: 14 August 1999.
___________________Journal of Contemporary Mathematical Analysis-Armenian Academy of Sciences
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