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Submitted on: 19 July 2014.
Revised on: 28 September 2014.
Accepted on: 04 November 2014.
___________________International Journal of Mathematical Engineering and Management Sciences
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Submitted on: 14 September 2002.
Revised on: 13 October 2002.
Accepted on: 30 October 2002.
___________________International Journal of Mathematical Engineering and Management Sciences
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Submitted on: 20 October 2011.
Revised on: 12 November 2011.
Accepted on: 01 January 2012.
___________________International Journal of Mathematical Engineering and Management Sciences
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