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Submitted on: 01 September 2013.
Revised on: 27 September 2013.
Accepted on: 01 November 2013.
___________________Bulletin of the Malaysian Mathematical Sciences Society
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Submitted on: 20 June 2009.
Revised on: 21 July 2009.
Accepted on: 10 August 2009.
___________________Bulletin of the Malaysian Mathematical Sciences Society
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