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Submitted on: 09 November 2004.
Revised on: 31 December 2004.
Accepted on: 09 February 2005.
___________________International Journal of Mathematical Engineering and Management Sciences
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Submitted on: 07 June 2014.
Revised on: 19 July 2014.
Accepted on: 05 August 2014.
___________________International Journal of Mathematical Engineering and Management Sciences